I am trying to rotate my external the orientation on my external display. I can get to rotation in the system settings for display, but I don't know how to choose the external display, it keeps rotating the one on my mac. How can I show it which one I want to rotate?
[Re-Titled by Moderator]
MacBook Air, macOS 14.6
The title of your post refers to "multiple external displays", and your tag line says you are running Sonoma, which would suggest you have a MacBook Air released in 2018 or later.
Note that the M1 and M2 MacBook Airs only support one external display. The M3 MacBook Airs only support a single external display with the lid open; two with the lid closed. If you have plugged in more displays than your MacBook Air supports, that might explain not being able to choose a display in System Settings > Displays.
You may or may not be able to rotate the external display. This feature may not be supported depending on your display device and model.
Rotate the image on your Mac display - Apple Support
Can I rotate multiple external displays on my MacBook Air?
