I'm currently using windows11(23H2 build 22635.3139)
I have my taskbar hidden as default. Moving the cursor to the bottom shows the hidden taskbar.
After updating Adobe Acrobat to the newest version, when using acrobat as full screen, the taskbar wouldn't show up. If it's not uesd as a full screen, the tasksbar shows normally.

In the screenshots below, when used with full screen, taskbar wouldn't show up. This is an issue that wasn't happening for the previous version.

Actually there are other people with the same issue. It would be very helpful if the bug is fixed. The link below show a community discussion about the issue that I've explained above.
https://community.adobe.com/t5/acrobat-reader-discussions/windows-taskbar-doesn-t-show-from-hide-when-acrobat-reader-is-open/td-p/14336533