I recently hooked up a second monitor to my iMac so that I could have one window for documentation open while working on other things on my main monitor. I use a Wacom tablet for drawing, and I quickly noticed a problem. The tablet was now active for the entire extended workspace, while I want it to correspond to the main monitor only.

I opened up the preferences pane but could not immediately see a setting for this, so I googled a bit. All I saw were old posts stating that this was not doable with the (at the time) current Wacom driver.

Looking closer at the preference pane, I found a setting called “Mapping”, and on opening this, I could indeed see a setting to restrict the tablet to only work with one of the monitors.

Activating this setting makes the tablet work as I want, so that the entire tablet surface is dedicated to the primary monitor. To reach the second monitor, I have to use the mouse.