Hi Gary, I am John J.D., a fellow Microsoft user like you.
To uninstall Facebook from your Windows 11 computer, you have a couple of options based on how you installed it. If you got it from the Microsoft Store as a widget, simply go to Settings > Apps > Installed app, and find the Facebook app to uninstall it.
Alternatively, if you installed it through Microsoft Edge, you can remove it by typing edge://apps into the Edge search bar and removing Facebook from there by clicking three-dots menu (...) then Uninstall. Let me know if you need any further assistance!
John J.D.