fix

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

         }
 
         void Input_OnEnable() {
+#if !UNITY_EDITOR && (UNITY_IOS || UNITY_ANDROID)       
+#endif
             _inputMode = Input.mousePresent ? UIWidgetsInputMode.Mouse : UIWidgetsInputMode.Touch;
         }
 
 #endif
 
         void Input_OnDisable() {
+#if !UNITY_EDITOR && (UNITY_IOS || UNITY_ANDROID)       
+#endif
         }
 
         void Input_Update() {