Open/Close menu only working once

I suspect this is because of the effect you selected. I recorded a video on how I would have handled this particular challenge: https://youtu.be/u-QmKt3SPdI

I suspect you are using the default motion effects, and the issue may be there. It is really necessary to use custom motion paths instead of those canned ones. Maybe have a look at the example in this blog post:

https://blog.lilybiri.com/sliding-menu

It is not easy to explain the reason for this change. But Fly in from and Fly out both set up the motion path from the location of the object which is on the end position for Fly in, and on the start position for Fly out. Whereas you need a relative motion path from the eact situation the object has before moving.

You need to prevent also that the same button is clicked twice in sequence. That could be done by disabling the Open button when the menu is open, and similar for the Close button.