I’ll be surprised if this hasn’t been suggested already, but I can’t find anything. It’s a small thing, but it’s just so annoying to switch between heroes in the gallery, especially when I want to go through every single character when switching on or off event-related cosmetics. On PS4, at least, not only do you have to go back to the hero select screen, but the cursor puts you back at the beginning on Ana so you have to scroll through everyone.
My suggestion, then, is to have the cursor remember the hero you were just on when you go back to the selection screen, and also to have a way to switch to the previous/next hero — On PS4, L1 and R1 would be perfect.
Another little QOL change would be being able to navigate between the far left and far right of the list on the selection screen — For example, hit left with the cursor on Ana to get to Mei.