Are you "clicking" on your wallpaper once it comes up? Often there are several areas you don't want to click on (stories about pictures, etc.) Most of that you can turn off but I can't tell which one you may've clicked on (or near). If it's coming up "automagically", try this:
In Windows 11, open Settings > System > Notifications, then scroll down and unfurl Additional settings. Disable Show the Windows welcome experience, Suggest ways to get the most out of Windows, and Get tips and suggestions.
Let us know how you make out. You may need to drill into "Notifications" a bit. If you're using a "lock" screen (PIN or Password) just try hitting ENTER (no clicking the mouse on anything) once or twice - once things come up and settle down.