"Add to favourite Line Styles" is grey... why?
 

I'm trying the trial and the mode is set to Pro. I have toggled the mode, quite / re-entered. No change. Why is this option disabled? I saw it enabled at one point, I selected it, but the style was never added to my favourites.

Why is this? Is there a defect or do I not understand how the feature works?

Replying to myself... I think that they are adding, but not with the proper display in favourites (i.e. not showing the arrow head).