Additional meeting and call-related features and issues within Microsoft Teams for Education
Hi MoojeanSeo,
According to your description, I have done some tests, If you make the screen bigger while you sharing your screen on windows, you cannot restore the settings in Teams, please follow below steps:
1: Search” Ease of Access version settings” in the search box on your computer, click it
2: Under Make everything bigger on the Display tab, expand the menu, and select the option you want.
You may need to sign out and back in again for some of the changes to take effect on certain apps, but it applies to most things immediately.
For more information, please see Make text and apps bigger.
if this is not your scenario, please share every detailed step about how you make the Teams sharing screen bigger, and I’d like to help you do more tests and research.
Regards,
Grace