I can select the dual extruder template, but I can only select one material for both extruders. What do I do if I want to use a different support material?
Just select the "flashforge dreamer (both extruders)" profile, then pick ABS from the auto-configure list. Next click on your Temperature tab and edit the temp for the right extruder to be 210C for PLA. That way the left is ABS and the right is PLA.