DB2 quick question about 3d mode

Ello.

I was fumbling around in 3d mode and suddenly I noticed flats were not highlighted when pointed at. Im pretty sure they were before, so I think I might have accidentally pressed some shortkeys to turn it off, but I cant find it in preferences. Any ideas how to get it back on?

I think by default "h" toggles 3d-mode highlighting?

*facepalm*

Thanks!