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Since some time ago this app has become unusable on externally connected monitors on android devices.The taskbar starts off hidden when you launch the app (as it should) but shows itself once a document is selected for some reason.
Hope you are doing well. Sorry for your experience with Acrobat Reader.
The Android UI and not Acrobat control the feature you mentioned above. Any changes to the taskbar or how you view the file cannot be changed by Adobe unless allowed to by Android.
Since the feature is still in development, there are specific third-party applications that can help you minimize the visibility of the taskbar.
Note: We cannot share any third-party application names here on the Adobe Community Boards, and they can pose a risk to your device.
Hope this clarifies your question.