Aspect ratio for 16:9 games

Hi there !

Lakka 2.1 / Raspberry Pi 3 / 1080p TV

Some PSX games have a “native” 16:9 / Widescreen option. When I set it on, the game indeed displays widescreen… but not fullscreen. Is there an option to zoom the picture and then play REAL fullscreen ?

I’m not sure about which values I have to set in “Aspect Ratio” settings in retroarch menu…

Thanks in advance !