My app size is 1920 x 900. In the Power App editor, if I full screen the app and then adjust the actual tab, it scales properly. However, when I publish the app to Teams, part of the app gets cut off.
The only way I can see the app properly is if I pop out the Tab in Teams and make it full screen, which my team does not want to do.
This is an image of the app in the dev environment, how IT SHOULD LOOK when published.

This is an image of the app in the Teams environment, how IT DOES LOOK.

As you can see, it is cut off on the right side. On the left are my teams omitted.