It's a little tedious to set up but if you run in Kiosk Mode with any animations triggered by a button you can make the button only appear when the last animation has finished.

If all the animations are timed then this is much simpler.

have a look at the demo here

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Microsoft PowerPoint MVP 2007-2023
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Hi John,
Thanks for your tip about the kiosk mode. it really disable the mouse and keyboard to control the navigation of the slides.

However, I found a little problem.
During transition between each slides, let's say I set up the duration of transition animation to 3secs, then if I click the mouse anywhere on the screen it interrupts the transition animation and it ruins my automatic presentation timings completely.
I am hoping that you still have some idea on how to eliminate this problem.
Many thanks in advance.