IsInputMatching return true, even I touch on the UI.
Is it possible to set it to return false when I touch on the UI?

No.
"Click" event that may occur when release the finger in the button area.

Is there a way to prevent triggering button when dragging the screen?

Thank you so much.
Could I know which script these methods is in?

Could I check if the camera is dragged by script?

Parallelogram

Could I set the boundary of the camera by other shapes not rectangle or circle?

I call CameraEvents.OnRequestObjectFollow?.Invoke(gameObject, focusOnFollow).
The camera always zoom in or out to the target. How could I set the camera only move to the target not zoom in or out?