Yes, It's visible. It's placed in "Sound, Video and Game devices" and called as "RME Fireface UC"

This is useful information? If not please let me know if you need to know more about this problem.
I would like to fix it as soon as possible.

You guys (RME support) should stop saying "Mac mode" and just tell them how to fix it. You're really bad about this on the entire forum, and you need to assume that most people don't read the entire user's manual, as appalling as that reality might be.

When disconnected from the computer, power on the unit and tap the rotary button twice. It will either say "PC" or some other letters that really mean "Mac". Keep pushing this until you're sure you're on the right one -- it's kinda janky, you have to sort of press the button four more times for it to be registered as another double tap.

Look at that, helping is fun!

I don't think it's your job to assume people have solved problems, but instead to make a place where answers to problems can be found. You don't think people buy your products used?

Anyway, here's the answer again for those (like me) who cannot find it anywhere else on the forum and want to bypass the unprofessional flame war:

When disconnected from the computer, power on the unit and tap the rotary button twice. It will either say "PC" or some other letters ("AP"?) that really mean "Mac". Keep pushing this until you're sure you're on the right one -- it's kinda janky, you have to sort of press the button four more times for it to be registered as another double tap.

Forums! Smiles!