add dpr override setting

com.unity.uiwidgets/Editor/UIWidgetsPanelEditor.cs

         public override void OnInspectorGUI() {
             base.OnInspectorGUI();
             EditorGUILayout.PropertyField(serializedObject.FindProperty("fonts"), true);
+            EditorGUILayout.PropertyField(serializedObject.FindProperty("devicePixelRatioEditorOnlyOverride"), new GUIContent(text: "[EditorOnly]DPR Override"), false);
             EditorGUI.BeginChangeCheck();
             UIWidgetsPanel panel = (UIWidgetsPanel)target;
             serializedObject.ApplyModifiedProperties(); 

com.unity.uiwidgets/Runtime/engine/UIWidgetsPanel.cs

             panels.Remove(panel);
         }
 
-        float _devicePixelRatioOverride;
-
-        public bool hardwareAntiAliasing;
-
+        public float devicePixelRatioEditorOnlyOverride;
+        
         public TextFont[] fonts;
 
         Configurations _configurations;
 #if !UNITY_EDITOR
                 return _wrapper.displayMetrics.DevicePixelRatioByDefault;
 #endif
+                if (devicePixelRatioEditorOnlyOverride != 0) {
+                    return devicePixelRatioEditorOnlyOverride;
+                }
+                
                 var currentDpi = Screen.dpi;
                 if (currentDpi == 0) {
                     currentDpi = canvas.GetComponent<CanvasScaler>().fallbackScreenDPI;