Thanks for your answer, but it didn't work for me. F9 did nothing in my case, pressed it several times. Using the CYCLE MFD HUD assigned key on my wheel goes from position list to box strategy options list, but then stays there. No way I can get rid of that list or even cycle back to position, etc. F9 works on Assetto Corsa, but not on Competizione, I guess.
ACC has a botched interface, there's even a place where the description is the same as another option way up... (and they aren't related). Will try to remove and reinstall the game, maybe something got wrong while upgrading from beta to full release... Wish I could get a refund, this time Kunos drop the ball for good, surprisingly. No TIR support, bad interface, slideshow/stutter... sad. Maybe in a few months they'll sort it out, but then I'll be playing AM2 for sure.