How to exit from Oculus Mirror mode?

I'm having difficulty linking my Windows pc to Quest 2 device. I can airlink them and get the code verified, but it goes into Ocuus Mirror mode immediately, and I cannot exit unless I turn it off. It simply says, "Your Library is empty, You have worlds to explore. Fill your library with apps and games from the Oculus Store!" The Oculus menu button doesn't work, and nothing seems to work when I'm in that mode. Can anyone help me with any tips? All I want to do is to work on my Unity project.