I often use my MacBook Air M1 with an external Dell screen. I set my Wacom Intuos BT M's settings that the Wacom only maps (works on) the Macbook's screen. However, whenever I use Illustrator, these settings are ignored and boths screens are mapped. (If I then go to another app the desired settings work again.) This is quite irritating as the half of the Wacom's drawing area works on the one screen and the other on the other screen, making it very difficult to illustrate.
Any suggestions on how to get Illustrator to work with the desired settings where the Wacom only maps my MacBook's screen while I still have the external scree plugged in?