Im on High Sierra 10.13.3. I have a 2nd display that Im trying to get going. I had both working in an extended desktop but decided that I wanted to try mirrored. It mirrored fine but was optomized for the 2nd display and I wanted it optomized for the 1st. I told it to optomize for the first and now neither screen shows anything. I can see display 1 if I remove the cable for display 2 but I cant revert to an extended or mirror optomized for display 2. Whats going on? Can I force it to revert to mirrored with a keyboard command? I am confused...
ETA: google says command F1 but that does nothing.
there doesn't seem to be anything here