Top bar of Powerpoint on my iPad takes up half the screen.

I'm using an iPad Pro 11.9" 2021.

When I tap on "Comments" to view comments in a Powerpoint file, it causes the top bar of Powerpoint to take up half the screen. I'm not sure why, as this did not happen with the same file that I'm viewing just yesterday.

Also, I've tried with different files, and it's always the same. I've tried uninstalling and reinstalling the PowerPoint app twice, to no avail. Also tried restarting my iPad.