Unless you changed it the ‘i’ on your keyboard should bring the status window, now since you mentioned the ‘beep’ sound, I do wonder if there is a dialogue window open ‘behind’ Xibo that actually has the focus - window asking you to save/run the .ppt file.
Could you please try that - PowerPoint media items show a "Navigation Cancelled" error when running on the Windows Player / PowerPoint brings up an Open Dialog (unless you already did).
Other than that, it would be good to confirm that there indeed a dialogue window.
You can do that by either:
Changing the Xibo player size in Display profile -> Location tab
When it will smaller you will see your desktop as well
Alternatively you could have some other layout running, press ‘i’ on bring status window and change layout to your layout with .ppt - it will make Xibo be no longer ‘always on top’ - so you will be able to alt+tab between other windows for example.