A few things to expect when playing Grand Theft Auto V on ONMO+:
Story Mode only
Grand Theft Auto V currently supports Story Mode only. GTA Online is not available yet, but we're actively working on supporting it in the near future.
Rockstar Games Launcher sign-in required
On first launch, you will need to sign in to your Rockstar Games account before you can play. This should only be required once.
Settings window on repeat launches
Display settings, in-game settings, shader compilation, or game agreements may appear on repeat launches. This is normal — make your selections or wait for the process to complete before playing.