While you can't quite remove Teams completely and indefintely at this time (that we're aware of), there are a few ways you can try to hide it from showing.
1) By default, Windows 11 shows a Teams Chat icon in your taskbar (that
looks like a purple word bubble with a camera icon inside). If you’d
like to hide it, right-click the taskbar and select “Taskbar Settings.”
When Settings opens to the Personalization ==> Taskbar page, expand the
“Taskbar Items” section if necessary, then click the switch beside
“Chat” to “Off.” The Chat icon will disappear immediately from your taskbar, however this doesn’t stop Teams from running in the background.
2) Teams also likes to
pop up whenever you log into your Windows account. To fix, first, open "Settings" by pressing Windows+i. Or you
can right-click the Start button and select “Settings.” When Settings appears, click “Apps” in the sidebar, then select “Startup.” In Startup settings, you’ll see a list of “Startup Apps” that launch
whenever you log in. Locate “Microsoft Teams” in the list and click the
switch to “Off.” After that, close the settings. If Teams is still running in the background,
quit it by clicking the caret arrow beside the speaker and Wi-Fi icons
in the taskbar (near the clock). When a tiny bubble menu appears,
right-click the Teams icon (purple with a “T” on it) and click “Quit.” At this point, Teams won’t run again unless you launch it manually,
although it’s still on your system. To remove it, check bullet point #3 below.
3) You can also remove Microsoft Teams from your application list without much effort. First, open "Settings" by pressing Windows+i (or
right-clicking the Start button and selecting “Settings”). In Settings,
click “Apps,” then select “Apps & Features.” Scroll down in the Apps List and locate “Microsoft Teams.” Click the
three vertical dots button beside its entry in and select “Uninstall.” Settings will ask you to confirm with a pop-up. Click “Uninstall” again.
After a moment, Microsoft Teams will completely vanish from the list of
installed Apps. Unfortunately, Teams is not completely removed from your system, because it’s an essential part of how the “Chat” taskbar icon works, per Microsoft. To keep Teams from coming back, disable the “Chat” icon in the taskbar (see the numbered bullet point above). If you click that icon, Teams will automatically reinstall itself again.