Hi Kunal.
When you assign a "WindowButtonDownFcn" callback to a "uifigure" in App Designer, you are overriding the default behavior of the mouse button press within the entire window of the app. As a result, built-in interactive features like zooming and panning can be affected, because the callback you've assigned takes precedence over the default behavior.
If your intention is to allow both the custom behavior defined in "WindowButtonDownFcn" and the default zoom/pan behaviors, you will need to implement some logic in your callback to determine when to execute custom actions and when to allow default behaviors.
