Hello Nicole_782242, thanks for coming into forums. I'm Myk, an Independent Advisor and I'll be more than happy to help you.
Kindly check if there's an available update for the MS teams app by clicking your Profile picture at the top right, click on Check for updates option.
If it's already up to date, you may attempt performing a Repair to MS Teams app by following the steps below:
- Right-click the Start button (lower-left corner), and select Apps and Features on the pop-up menu.
- Select the MS Teams app in the list
- Click on Advanced options
- Click Repair
However, if it's still not adjusting the font size, you may uninstall, and reinstall MS Teams app for further isolation.
If you require any further information, then please don’t hesitate to get in contact. I will be more than happy to assist you further.
Kind Regards,
Myk