Are you sure you don't have a tiny switch on the side? The manual indicates it should have one -

I do, but when on the windows mode the keys mentioned are in the wrong positions.

Edit and if i switch to the macOS mode. The right alt-gr key is not mapped correctly.

On macOS:

I use my Keychron C3 in Windows mode because the macOS mode ain't right with the bottom left corner keys.

Maybe placement of Control/Option/Command aren't similar enough to the MacBook Pro keyboard for me.

Been meaning to figure this out and fix it... swapping physical keycaps or remapping in software or replacing the keyboard...

	▲	martinjc an hour ago \| parent [-]
		Waiting for it to die and will not buy another of theirs. Piece of shit.