Bezels are covering up my game screen when playing vertical shooters (retroarch + mamelibretro)

[Hamburglin]

My vertical shooter games are loading wider than they should in retroarch/mamelibretro. Anyone know how to set the games to be the correct resolution/size/orientation to fix this?

[MazJohn [Mr Arcade]]

What worked for me was to set auto scale to enabled under overlays inside of retro-arch. Make sure the video layout as proportioned as you wish for that particular core.

[Hamburglin]

Thanks. What worked for me was setting the aspect ratio in video setting to "let core decide".

The problem is that they were hard set to 4:3 instead of dynamically changing to 3:4.