This can happen for a number of reasons, but the biggest reason is the computer having been open or on too long. Simply restart your computer to see if this solves the issue. See the guide here
Click on the blue Onedrive icon on your taskbar. In the prompt that opens, click on the cog wheel in the top right corner. Then click on "Quit Onedrive". Wait about 10 or so seconds for Onedrive to fully close. At this point it will no longer appear ...
Navigate to your desktop Right click and on the drop down select "Display Settings" From here it will pull up a page showing the monitors and settings for them The box showing 1, would be your laptop or desktop screen. Any others will be your ...