These "flaps" don't need folding, and don't have a crease line pre-cut. You can check them right there on the place where the VR Goggles are set.
It just became ugly and was completely unnecessary. It's parallel with that upper triangular "flap". They don't need to fold to fit or for any purpose at all. In fact, these flaps aren't really flaps, they just look like flaps, they are just the result of the negative flap cut out of the piece to give room for the grommet, so something got lost in translation when preparing the instructions. It's an honest mistake, even huge and extremely expensive Lego sets sometimes come with instruction mistakes.
The part I had to cut out I also documented, but I'll post it in a later occasion.