On Microsoft Teams, the app runs in the background as soon as it starts after sign into Windows 10 (or other supported operating systems). If you try to close the app, it will keep running in the background, minimized in the notification area in the taskbar. If you do not need Teams running all the time, or if you prefer to fully close the app when clicking the “X” button, you will need to adjust the settings manually.
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Open Microsoft Teams.
Click on the Settings and more (ellipsis) button from the top-right corner.
Select the Settings option.
Click on General.
Under the “Application” section, clear the On close, keep the application running option.