Close all open applications and files at one time.
I know you can click on the menu at the top left to close an application. I know you can press command q to quit out of an app and I know you can alternate command q and command tab a bunch of times until every application is closed. But it seems like there should be an item in the apple menu that will close "everything" and leave the system like it was when you booted up.
Mac mini, macOS 15.3