diff --git a/app/src/main/java/net/helcel/beans/activity/adapter/GeolocListAdapter.kt b/app/src/main/java/net/helcel/beans/activity/adapter/GeolocListAdapter.kt
index d0181d1..7e31f29 100644
--- a/app/src/main/java/net/helcel/beans/activity/adapter/GeolocListAdapter.kt
+++ b/app/src/main/java/net/helcel/beans/activity/adapter/GeolocListAdapter.kt
@@ -15,6 +15,7 @@ import net.helcel.beans.countries.GeoLoc
 import net.helcel.beans.databinding.ItemListGeolocBinding
 import net.helcel.beans.helper.AUTO_GROUP
 import net.helcel.beans.helper.Data
+import net.helcel.beans.helper.DialogCloser
 import net.helcel.beans.helper.NO_GROUP
 import net.helcel.beans.helper.Settings
 import net.helcel.beans.helper.Theme.colorWrapper
@@ -52,7 +53,7 @@ class GeolocListAdapter(
         private val _binding: ItemListGeolocBinding,
         private val _parentHolder: FoldingListViewHolder? = null,
         private val _parentGeoLoc: GeoLoc,
-    ) : RecyclerView.ViewHolder(_binding.root) {
+    ) : RecyclerView.ViewHolder(_binding.root), DialogCloser {
 
         private fun bindGroup(el: GeoLoc) {
             refreshCount(el)
@@ -86,11 +87,11 @@ class GeolocListAdapter(
                     if (_binding.checkBox.isChecked) {
                         // If one has just checked the box (assign unique group)
                         Data.selected_group = Data.groups.getUniqueEntry()
-                        onColorDialogDismiss(false)
+                        onDialogDismiss(false)
                     } else {
                         // If one has just unchecked the box (unassign unique group)
                         Data.selected_group = null
-                        onColorDialogDismiss(true)
+                        onDialogDismiss(true)
                     }
                 } else {
                     Data.selected_group = null
@@ -103,7 +104,7 @@ class GeolocListAdapter(
             }
         }
 
-        fun onColorDialogDismiss(clear: Boolean) {
+        override fun onDialogDismiss(clear: Boolean) {
             if (clear) {
                 Data.visits.setVisited(Data.selected_geoloc, NO_GROUP)
                 Data.saveData()
diff --git a/app/src/main/java/net/helcel/beans/activity/adapter/GroupListAdapter.kt b/app/src/main/java/net/helcel/beans/activity/adapter/GroupListAdapter.kt
index 1f4806a..1dae265 100644
--- a/app/src/main/java/net/helcel/beans/activity/adapter/GroupListAdapter.kt
+++ b/app/src/main/java/net/helcel/beans/activity/adapter/GroupListAdapter.kt
@@ -13,7 +13,8 @@ import net.helcel.beans.helper.Theme.getContrastColor
 
 class GroupListAdapter(
     private val activity: FragmentActivity,
-    private val selectDialog: DialogFragment
+    private val selectDialog: DialogFragment,
+    private val delete: Boolean = false
 ) : RecyclerView.Adapter<GroupListAdapter.GroupViewHolder>() {
 
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): GroupViewHolder {
@@ -63,12 +64,14 @@ class GroupListAdapter(
                 Data.selected_group = entry.second
                 selectDialog.dismiss()
             }
-            _binding.groupColor.setOnLongClickListener {
-                dialogFragment.show(
-                    activity.supportFragmentManager,
-                    "AddColorDialogFragment"
-                )
-                true
+            if (!delete) {
+                _binding.groupColor.setOnLongClickListener {
+                    dialogFragment.show(
+                        activity.supportFragmentManager,
+                        "AddColorDialogFragment"
+                    )
+                    true
+                }
             }
         }
     }
diff --git a/app/src/main/java/net/helcel/beans/activity/fragment/EditGroupAddFragment.kt b/app/src/main/java/net/helcel/beans/activity/fragment/EditGroupAddFragment.kt
index 83b64ff..184ec74 100644
--- a/app/src/main/java/net/helcel/beans/activity/fragment/EditGroupAddFragment.kt
+++ b/app/src/main/java/net/helcel/beans/activity/fragment/EditGroupAddFragment.kt
@@ -52,8 +52,8 @@ class EditGroupAddFragment(
                 .setPositiveButton(android.R.string.ok) { _, _ ->
                     val pos = Data.groups.findGroupPos(key)
                     // Remove all countries belonging to that group
-                    // Delete the group
                     Data.visits.deleteVisited(key)
+                    // Delete the group
                     Data.groups.deleteGroup(key)
                     Data.saveData()
                     onDelCb(pos)
diff --git a/app/src/main/java/net/helcel/beans/activity/fragment/EditPlaceColorFragment.kt b/app/src/main/java/net/helcel/beans/activity/fragment/EditPlaceColorFragment.kt
index 4621df0..53d1046 100644
--- a/app/src/main/java/net/helcel/beans/activity/fragment/EditPlaceColorFragment.kt
+++ b/app/src/main/java/net/helcel/beans/activity/fragment/EditPlaceColorFragment.kt
@@ -3,17 +3,19 @@ package net.helcel.beans.activity.fragment
 import android.app.Dialog
 import android.content.DialogInterface
 import android.os.Bundle
+import android.view.View
 import androidx.fragment.app.DialogFragment
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
-import net.helcel.beans.activity.adapter.GeolocListAdapter
+import net.helcel.beans.R
 import net.helcel.beans.activity.adapter.GroupListAdapter
 import net.helcel.beans.databinding.FragmentEditPlacesColorsBinding
 import net.helcel.beans.helper.Data
+import net.helcel.beans.helper.DialogCloser
 
 
-class EditPlaceColorFragment(private val parent: GeolocListAdapter.FoldingListViewHolder) :
+class EditPlaceColorFragment(private val parent: DialogCloser, private val delete: Boolean = false) :
     DialogFragment() {
 
     private lateinit var _binding: FragmentEditPlacesColorsBinding
@@ -21,7 +23,8 @@ class EditPlaceColorFragment(private val parent: GeolocListAdapter.FoldingListVi
     private var clear: Boolean = false
 
     override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
-        val builder = MaterialAlertDialogBuilder(requireContext())
+        val ctx = requireContext()
+        val builder = MaterialAlertDialogBuilder(ctx)
         _binding = FragmentEditPlacesColorsBinding.inflate(layoutInflater)
         _binding.btnAdd.setOnClickListener {
             EditGroupAddFragment(0, {
@@ -34,16 +37,25 @@ class EditPlaceColorFragment(private val parent: GeolocListAdapter.FoldingListVi
         }
 
         val dialog = builder.setView(_binding.root).create()
-        listAdapt = GroupListAdapter(requireActivity(), this)
+        listAdapt = GroupListAdapter(requireActivity(), this, delete)
         _binding.groupsColor.layoutManager =
-            LinearLayoutManager(requireContext(), RecyclerView.VERTICAL, false)
+            LinearLayoutManager(ctx, RecyclerView.VERTICAL, false)
         _binding.groupsColor.adapter = listAdapt
 
+        if (delete) {
+            _binding.btnAdd.visibility = View.GONE
+            _binding.btnClear.text = ctx.getString(R.string.cancel)
+            with (_binding.warningText) {
+                visibility = View.VISIBLE
+                text = ctx.getString(R.string.select_group)
+            }
+        }
+
         return dialog
     }
 
     override fun onDismiss(dialog: DialogInterface) {
         super.onDismiss(dialog)
-        parent.onColorDialogDismiss(clear)
+        parent.onDialogDismiss(clear)
     }
 }
diff --git a/app/src/main/java/net/helcel/beans/activity/fragment/SettingsFragment.kt b/app/src/main/java/net/helcel/beans/activity/fragment/SettingsFragment.kt
index c334480..e02414b 100644
--- a/app/src/main/java/net/helcel/beans/activity/fragment/SettingsFragment.kt
+++ b/app/src/main/java/net/helcel/beans/activity/fragment/SettingsFragment.kt
@@ -1,19 +1,52 @@
 package net.helcel.beans.activity.fragment
 
+import android.annotation.SuppressLint
 import android.content.Context
+import android.content.DialogInterface
 import android.os.Bundle
 import androidx.appcompat.app.AppCompatDelegate
 import androidx.preference.Preference
 import androidx.preference.PreferenceFragmentCompat
+import androidx.preference.PreferenceManager
 import net.helcel.beans.R
 import net.helcel.beans.countries.GeoLocImporter
+import net.helcel.beans.helper.Data
+import net.helcel.beans.helper.DialogCloser
+import net.helcel.beans.helper.Settings
 
 
-class SettingsFragment : PreferenceFragmentCompat() {
+class SettingsFragment : PreferenceFragmentCompat(), DialogCloser {
+    private var savedInstanceState: Bundle? = null
+    private var rootKey: String? = null
 
     override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
+        this.savedInstanceState = savedInstanceState
+        this.rootKey = rootKey
+
         setPreferencesFromResource(R.xml.fragment_settings, rootKey)
         val ctx = requireContext()
+
+        // Select Light/Dark/System Mode
+        findPreference<Preference>(getString(R.string.key_theme))?.setOnPreferenceChangeListener { _, key ->
+            setTheme(ctx, key as String)
+        }
+
+        // Toggle groups
+        findPreference<Preference>(getString(R.string.key_group))?.setOnPreferenceChangeListener { _, key ->
+            if (key as String == ctx.getString(R.string.off)) {
+                val fragment = EditPlaceColorFragment(this, true)
+                fragment.show(
+                    this.parentFragmentManager,
+                    "AddColorDialogFragment"
+                )
+                false
+            } else {
+                true
+            }
+        }
+
+
+        // Toggle regional geolocs
         findPreference<Preference>(getString(R.string.key_regional))?.setOnPreferenceChangeListener { _, key ->
             when (key as String) {
                 ctx.getString(R.string.off) -> GeoLocImporter.clearStates()
@@ -22,10 +55,6 @@ class SettingsFragment : PreferenceFragmentCompat() {
             true
         }
 
-        // Select Light/Dark/System Mode
-        findPreference<Preference>(getString(R.string.key_theme))?.setOnPreferenceChangeListener { _, key ->
-            setTheme(ctx, key as String)
-        }
 
         // Open license fragment
         findPreference<Preference>(getString(R.string.licenses))?.setOnPreferenceClickListener {
@@ -58,4 +87,30 @@ class SettingsFragment : PreferenceFragmentCompat() {
             return true
         }
     }
+
+    override fun onDialogDismiss(clear: Boolean) {
+        // When turning groups off, select one group to keep and reassign everything
+        Data.selected_group?.let { selectedGroup ->
+            // Reassign all visited that are not to selectedGroup to selectedGroup
+            Data.visits.reassignAllVisitedtoGroup(selectedGroup.key)
+
+            // Delete all groups that are not selectedGroup
+            Data.groups.deleteAllExcept(selectedGroup.key)
+
+            // Save and clear global variables
+            Data.saveData()
+            Data.selected_geoloc = null
+            Data.selected_group = null
+
+            // Actually change preference
+            val ctx = requireContext()
+            val sp = PreferenceManager.getDefaultSharedPreferences(ctx)
+            sp.edit().putString(ctx.getString(R.string.key_group), ctx.getString(R.string.off))
+                .commit()
+
+            // Refresh entire preference fragment to reflect changes
+            preferenceScreen.removeAll()
+            onCreatePreferences(savedInstanceState, rootKey)
+        }
+    }
 }
\ No newline at end of file
diff --git a/app/src/main/java/net/helcel/beans/helper/DialogCloser.kt b/app/src/main/java/net/helcel/beans/helper/DialogCloser.kt
new file mode 100644
index 0000000..eba0822
--- /dev/null
+++ b/app/src/main/java/net/helcel/beans/helper/DialogCloser.kt
@@ -0,0 +1,5 @@
+package net.helcel.beans.helper
+
+interface DialogCloser {
+    fun onDialogDismiss(clear: Boolean)
+}
\ No newline at end of file
diff --git a/app/src/main/java/net/helcel/beans/helper/Groups.kt b/app/src/main/java/net/helcel/beans/helper/Groups.kt
index 84f972f..850ebe9 100644
--- a/app/src/main/java/net/helcel/beans/helper/Groups.kt
+++ b/app/src/main/java/net/helcel/beans/helper/Groups.kt
@@ -28,6 +28,11 @@ class Groups(val id: Int, private val grps: HashMap<Int, Group>) {
         grps.remove(key)
     }
 
+    fun deleteAllExcept(grp: Int) {
+        val keysToDelete = grps.keys.filter { it != grp }
+        keysToDelete.forEach { grps.remove(it) }
+    }
+
     fun getGroupFromKey(key: Int): Group {
         return grps.getOrDefault(key, EmptyGroup())
     }
@@ -60,6 +65,10 @@ class Groups(val id: Int, private val grps: HashMap<Int, Group>) {
         return grps.keys.toList().indexOf(key)
     }
 
+    fun forEach(action: (Map.Entry<Int, Group>) -> Unit) {
+        grps.forEach { action(it) }
+    }
+
     class EmptyGroup : Group(0, "")
 
     @Serializable
diff --git a/app/src/main/java/net/helcel/beans/helper/Visits.kt b/app/src/main/java/net/helcel/beans/helper/Visits.kt
index 3d93554..71c36f1 100644
--- a/app/src/main/java/net/helcel/beans/helper/Visits.kt
+++ b/app/src/main/java/net/helcel/beans/helper/Visits.kt
@@ -42,6 +42,15 @@ class Visits(val id: Int, private val locs: HashMap<String, Int>) {
         return locs.keys.groupBy { getVisited(it) }
     }
 
+    fun reassignAllVisitedtoGroup(group: Int) {
+        val keys = locs.filter { (_, grp) ->
+            grp !in listOf(NO_GROUP, AUTO_GROUP)
+        }.keys
+        keys.forEach {
+            locs[it] = group
+        }
+    }
+
     @OptIn(ExperimentalSerializationApi::class)
     @Serializer(Visits::class)
     class VisitsSerializer {
diff --git a/app/src/main/res/layout/fragment_edit_places_colors.xml b/app/src/main/res/layout/fragment_edit_places_colors.xml
index 101a23a..5484e28 100644
--- a/app/src/main/res/layout/fragment_edit_places_colors.xml
+++ b/app/src/main/res/layout/fragment_edit_places_colors.xml
@@ -6,6 +6,13 @@
     android:orientation="vertical"
     android:padding="16dp">
 
+    <TextView
+        android:id="@+id/warning_text"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="10dp"
+        android:visibility="gone" />
+
     <ScrollView
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
diff --git a/app/src/main/res/values/en.xml b/app/src/main/res/values/en.xml
index 673c4c6..8b4e497 100644
--- a/app/src/main/res/values/en.xml
+++ b/app/src/main/res/values/en.xml
@@ -21,6 +21,7 @@
     <string name="foss_licenses">Free and open source dependencies and licenses</string>
     <string name="about_beans">About the Beans application</string>
     <string name="delete_group">Are your sure you want to delete this group and remove all its country mappings?</string>
+    <string name="select_group">Select one group you want to keep. All others will be deleted and its mappings reassigned to the group you choose here.</string>
     <string name="add">Add</string>
     <string name="clear">Clear</string>
     <string name="logo">Logo</string>