diff --git a/ftl/core/preferences.ftl b/ftl/core/preferences.ftl
index 4ebb21585..a2555992f 100644
--- a/ftl/core/preferences.ftl
+++ b/ftl/core/preferences.ftl
@@ -68,6 +68,8 @@ preferences-scheduler = Scheduler
 preferences-user-interface = User Interface
 preferences-import-export = Import/Export
 preferences-network-timeout = Network timeout
+preferences-reset-window-sizes = Reset Window Sizes
+preferences-reset-window-sizes-complete = Window sizes and locations have been reset.
 
 ## NO NEED TO TRANSLATE. This text is no longer used by Anki, and will be removed in the future.
 
diff --git a/qt/aqt/forms/preferences.ui b/qt/aqt/forms/preferences.ui
index 8803b82ce..fc2600a34 100644
--- a/qt/aqt/forms/preferences.ui
+++ b/qt/aqt/forms/preferences.ui
@@ -85,13 +85,6 @@
           <string>preferences_user_interface</string>
          </property>
          <layout class="QGridLayout" name="gridLayout_2">
-          <item row="1" column="1">
-           <widget class="QComboBox" name="styleComboBox">
-            <property name="currentText">
-             <string/>
-            </property>
-           </widget>
-          </item>
           <item row="0" column="1">
            <widget class="QComboBox" name="theme"/>
           </item>
@@ -111,10 +104,10 @@
             </property>
            </widget>
           </item>
-          <item row="2" column="0">
-           <widget class="QLabel" name="uiSizeLabel">
-            <property name="text">
-             <string>preferences_user_interface_size</string>
+          <item row="1" column="1">
+           <widget class="QComboBox" name="styleComboBox">
+            <property name="currentText">
+             <string/>
             </property>
            </widget>
           </item>
@@ -132,6 +125,20 @@
             </property>
            </widget>
           </item>
+          <item row="2" column="0">
+           <widget class="QLabel" name="uiSizeLabel">
+            <property name="text">
+             <string>preferences_user_interface_size</string>
+            </property>
+           </widget>
+          </item>
+          <item row="3" column="0" colspan="2">
+           <widget class="QPushButton" name="resetWindowSizes">
+            <property name="text">
+             <string>preferences_reset_window_sizes</string>
+            </property>
+           </widget>
+          </item>
          </layout>
         </widget>
        </item>
diff --git a/qt/aqt/preferences.py b/qt/aqt/preferences.py
index 5fa3da198..7061ac5cf 100644
--- a/qt/aqt/preferences.py
+++ b/qt/aqt/preferences.py
@@ -276,6 +276,7 @@ class Preferences(QDialog):
         self.form.styleLabel.setVisible(not is_win)
         self.form.styleComboBox.setVisible(not is_win)
         self.form.legacy_import_export.setChecked(self.mw.pm.legacy_import_export())
+        qconnect(self.form.resetWindowSizes.clicked, self.on_reset_window_sizes)
 
         self.setup_language()
         self.setup_video_driver()
@@ -302,6 +303,13 @@ class Preferences(QDialog):
     def on_theme_changed(self, index: int) -> None:
         self.mw.set_theme(Theme(index))
 
+    def on_reset_window_sizes(self) -> None:
+        suffixes = ["Geom", "State", "Splitter"]
+        for key in list(self.prof.keys()):
+            if any(key.endswith(suffix) for suffix in suffixes):
+                del self.prof[key]
+        showInfo(tr.preferences_reset_window_sizes_complete())
+
     # legacy - one of Henrik's add-ons is currently wrapping them
 
     def setupOptions(self) -> None: