Retroarch Mac fullscreen - I really need an help

Ok friends, I really, really need you help.

This is the problem.

I’m running retroarch with mame on my mac.

I use overlays. I resize them and set custom height/width/x/y settings for each roms (via .cfg files) so that each game perfectly runs “inside” its bezel.

The problem is that since Retroarch (and mame?) run at full screen using the current desktop resolution, if I correctly set all overlays and roms .cfg on my desktop computer (running i.e. u/1980x1020), when I move to my laptop, using the same settings, everything is messed up, because my laptop starts at fullscreen using its own desktop resolution (i.e. u/1440x900).

I’d like to force Retroarch (and/or mame?) to run at fullscreen at a fixed resolution (i.e. 1280x800, or anything else) so that the settings I apply to overlays and roms.cfg will be perfect on every computer I use regardless of its standard desktop resolution.

Just to mention, I’ve already use these options in retroarch.cfg (video_fullscreen = “true” - video_windowed_fullscreen = “false” - video_fullscreen_x = “1280” - video_fullscreen_y = “800”), but retroarch still runs at desktop resolution (i.e. on my desktop machine u/1980x1020).

Reading the log file it states:

[INFO] [Video]: Video @ 1280x800 [INFO] [GL]: Found GL context: cocoagl [INFO] [GL]: Detecting screen resolution 480x360. [INFO] [GL]: Vendor: Intel Inc., Renderer: Intel® UHD Graphics 630. [INFO] [GL]: Version: 2.1 INTEL-16.4.5. [INFO] [GL]: Using resolution 1920x1200 [INFO] [Video]: Graphics driver did not initialize an input driver. Attempting to pick a suitable driver.

Thanks a lot in advance friends.