Enable Windowed Fullscreen. If it still doesn’t work, then activate Virtual Super Resolution (VSR) / Dynamic Super Resolution (DSR) in your video card software settings, so you can choose higher resolutions.
If nothing helps, then try to change the resolution in the config file:
- go to “
?:\Users\?\Documents\Warcraft III
” - open “War3Preferences.txt”
- go to “[Video]” and change the values of “resheight” & “reswidth” to your prefered resolution.