I have this issue with a couple emulators.
There are probably other ways, but Autohotkey fixes all.
Have Mala run this autohotkey script when it exits the game on that particular emulator.
Only change the numbers in the first section to match your regular desktop resolution.
Do not change anything else.
cD = 32 ; bits (quality) - you can change to suit your requirments
sW = 1920 ; pixels - you can change to suit your requirments
sH = 1080 ; pixels - you can change to suit your requirments
rR = 60 ; Hz (frequency) - you can change to suit your requirments
ChangeDisplaySettings( cD, sW, sH, rR )
ExitAPP
Return
ChangeDisplaySettings( cD, sW, sH, rR ) {
VarSetCapacity(dM,156,0), NumPut(156,dM,36)
DllCall( "EnumDisplaySettingsA", UInt,0, UInt,-1, UInt,&dM ), NumPut(0x5c0000,dM,40)
NumPut(cD,dM,104), NumPut(sW,dM,108), NumPut(sH,dM,112), NumPut(rR,dM,120)
Return DllCall( "ChangeDisplaySettingsA", UInt,&dM, UInt,0 )
}