diff --git a/src/python/config_files.py b/src/python/config_files.py
index 7dc92478..3eab57bc 100644
--- a/src/python/config_files.py
+++ b/src/python/config_files.py
@@ -99,6 +99,7 @@ class UIState(JSONConfigFile):
 
     async def default_data(self) -> JsonData:
         return {
-            "page":           "Pages/Default.qml",
-            "pageProperties": {},
+            "page":                "Pages/Default.qml",
+            "pageProperties":      {},
+            "sidePaneManualWidth": None,
         }
diff --git a/src/qml/SidePane/SidePane.qml b/src/qml/SidePane/SidePane.qml
index 5cb6fa54..6a4d2b8e 100644
--- a/src/qml/SidePane/SidePane.qml
+++ b/src/qml/SidePane/SidePane.qml
@@ -16,6 +16,18 @@ HRectangle {
     property bool manuallyResized: false
     property int manualWidth: 0
 
+    Component.onCompleted: {
+        if (window.uiState.sidePaneManualWidth) {
+            manualWidth     = window.uiState.sidePaneManualWidth
+            manuallyResized = true
+        }
+    }
+
+    onManualWidthChanged: {
+        window.uiState.sidePaneManualWidth = manualWidth
+        window.uiStateChanged()
+    }
+
     property int maximumCalculatedWidth: Math.min(
         manuallyResized ? manualWidth : theme.sidePane.maximumAutoWidth,
         window.width - theme.minimumSupportedWidthPlusSpacing
@@ -27,7 +39,7 @@ HRectangle {
 
 
     property int calculatedWidth: Math.min(
-        manuallyResized ? manualWidth: parentWidth * autoWidthRatio,
+        manuallyResized ? manualWidth : parentWidth * autoWidthRatio,
         maximumCalculatedWidth
     )