I've set up my Raspberry Pi (with Raspbian Lite) running the GSPlus emulator, and the minimum possible X-Windows software to display on start up. The problem is that the emulator only displays in the top left corner of my monitor. What am I missing to have it stretch to fill the screen? I don't think that this is GSPlus specific - I imagine that there's a config that applies to all graphic software to stretch to fill display (I hope I'm right!). I've tried doing the same with a ZXSpectrum emulator, only to get the same result.
Combian and DOSBian do it right - so what am I doing wrong?