We can disable the recents fonts list in the character panel by making the number of recent fonts 0 in preferences panel. While working it always changes if you need to see recents fonts or not. I suggest to put a "show recent fonts" button the top of the character panel, near the "show recently added", "show activated fonts" buttons. The name of button can be "Show recents fonts". It is that simple. And we again can define the number of recent fonts from preferences panel.