- Open the Settings app.
- Go to System → Display → Graphics.
- Select Add desktop app in Add an app.
- Click Browse and locate GnollHackM.exe in
C:\Program Files (x86)\Steam\steamapps\common\GnollHack. - GnollHackM should appear in the list.
- Click GnollHackM, which should open a list of options.
- Select High performance or Power Saving in GPU preference.