I accidentally clicked on "Hide UI" in combat (Poker) after activating Katie (and before selecting her action) - now I am unable to finish the combat - and I haven't saved the game for a good moment - because I don't find a way to have the UI show up again (there is no icon like in the other scenes) .... didn't find anything on the internet as well. Help? 

Edit: Testing hitting any key (nothing to lose) I found it - "H" does the job :)