Black bar when in maximize mode, chromebook

Below is a picture with the window not in maximize mode:
Screenshot 2025-10-22 11.09.56 AM
But when I maximize it it does this:


There is a black bar. This only happened just recently, and yes i have tried restarting my chromebook and mit app inventor

Does this only happen when you have the Companion app open? In a window/minimised ?

Does this happens on other web sites?

A black bar in the Chrome browser on a Chromebook [can be fixed by toggling full-screen mode with the F11 key](Google Search text**)

It's only on the companion app

That's on a chrome browser, not mit app inventor companion

Yes, my project is a web browser, and it happens even before it loads in (like the companion home screen)


It's only on companion, I tried with Google Play (another Android app), and it doesn't do it

Ran some tests on my Chromebook with companion app running, not seeing any issues, no black bar, working just as expected.

Yeah, same with my friend, he says it's not happening to him