Hi, Therresa
Good day!
Thank you for posting to Microsoft Community. We are happy to assist you.
Accroding to your description, to change the default tab that opens when you start Teams, please follow these steps:
- Open Microsoft Teams.
- Click on your profile picture in the top right corner.
- Select "Settings" from the drop-down menu.
- Click on "General" in the left-hand menu.
- Under the "Application" section, you will see an option for "Open application in." Select "Teams" from the drop-down menu.
- Click "Save" at the bottom of the page.
This should change the default tab that opens when you start Teams to the "Teams" tab.
If the issue persists, please give an attempt for clearing the cache for your Teams - Clear Teams cache - Microsoft Teams | Microsoft Learn.
Thanks for your attempts and looking forward to your new updates.
Hope you all the best!
Sincerely,
Alex | Microsoft Community Moderator.