You can change your Windows 10 login screen through your device's Settings app, and make it display any photo you like.
Right-click on your desktop and select “Personalize.” Click “Background.” Under “Personalize your background,” open the dropdown menu. Select “Picture” or “Solid color” instead of “Windows Spotlight.” ...
You can change your background on Microsoft Teams both before and during meetings, similar to many other video-conferencing ...