Thanks for your post and welcome to the Community!
I tested your same scenario connecting fom a Samsung Galaxy S6 to a Windows 10 machine. I was able to open a PowerPoint presentation on the Windows machine and fom the Android and switch the PowerPoint to full screen mode and could still see and switch to the next slildes.
Please ensure that you have the latest version of TeamViewer installed on the Windows machine and test again.
Let us know the results after you have tested.
Allt the best,
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