desktop switch with external screen
Using an extra screen on my macbook :
I used to run one application on the macbook screen plus various applications on the external screen using various desktops. When doing the three-finger shift, I could toggle between the various screens on the extra screen, the macbook screen remaining unchanged and not moving.
Today, the macbook screen is sliding together with the external one. Very annoying. Must be a setting I changed accidentally, but I can't find it. Who can help me ? Thanks !
MacBook