A bit late , but I have just shared an example to drag the camera with the mouse, it should also work for a menu, the only thing you need to do is move the camera only on the Y axis (delete or disable the events used to move it on the X):
Example:
, but I have just shared an example to drag the camera with the mouse, it should also work for a menu, the only thing you need to do is move the camera only on the Y axis (delete or disable the events used to move it on the X):