Can I adjust or repair this ventilation setting dial which won't stay in place?

I have a 2012 Subaru Impreza. The knob which sets where the vents are directed refuses to stay in the leftmost setting (which directs air to the upper vents only). It can be turned that far manually but refuses to click into place and sits in an intermediate position instead. I can feel some moderate extra resistance when trying to get it into position.

Position it is supposed to stay in:

Where it actually sits if I don’t hold it:

Position of the next setting, just for reference:

Is there any way to repair or adjust this?