Add setting controlling when panes should collapse

src/backend/user_files.py

@@ -196,6 +196,7 @@ class UISettings(JSONDataFile):
             "alertOnMessageForMsec": 4000,
             "clearRoomFilterOnEnter": True,
             "clearRoomFilterOnEscape": True,
+            "collapseSidePanesUnderWindowWidth": 400,
             "theme": "Midnight.qpl",
             "writeAliases": {},
             "media": {

src/gui/Base/HDrawer.qml

@@ -54,7 +54,8 @@ Drawer {
     property Item referenceSizeParent: parent
 
     property bool collapse:
-        (horizontal ? window.width : window.height) < 400 * theme.uiScale
+        (horizontal ? window.width : window.height) <
+        window.settings.collapseSidePanesUnderWindowWidth * theme.uiScale
 
     property int peekSizeWhileCollapsed:
         horizontal ? referenceSizeParent.width : referenceSizeParent.height