This happens regularly when I use my Wacom Pro pen:
I can’t use Wacoms pan/scroll (mapped to pen buttons) in that window (I think it’s a limitation of Adobe or Wacom’s shitty drivers) so I have to click the scrollbar to “jump” up or down. Or I click and drag the scrollbar to move around.
Annoyingly, sometimes instead of clicking the scrollbar, I somehow miss and it scrolls the font window to the right (as you can see in screen shot above).
From there, I am unable to reset the scroll back to the left.
Please include a horizontal scroll bar so it’s easy for me to reset.