Cannot change gamma setting of monitors individually

I am trying to color correct multiple displays. In the system settings I can change the gamma for all monitors, but it wont let me change it for only one monitor at a time. There is a greyed out drop down menu in the bottom right corner that appears to allow for selecting only 1 monitor at a time for adjustment however I just cant seem to get this menu activated. The option ‘Sync screens’ is not enabled so I am unsure what is preventing this. I am running arch linux with x11