Thank you for your help. The latoptop screen is smaller than the HDMI TV.
The TV is 1080 and the latop is 768.
The recalbox install is stock default.
So far i have turned off the laptop screen by creating a .xinitrc file and adding:
Xrandr —output LVDS1 —off
This seems to help because when the emulation station screen boots it loads full screen on the TV HDMI.
I’ve checked the mupen64plus.cfg and the values are:
ScreenWidth = 1366
ScreenHeight = 768
I changed these to 1920 and 1080 but i still had the same problem. However, on rechecking the file i noticed that they had been reset to 1366 and 768.
I dont know why this happened, do you think this may be whats causing it? Do you think these values are getting reset bu something else (i.e because the laptop is reporting its screen size?)