For more detailed troubleshooting, you can check community discussions on the Kingdom Hearts Steam Forum or the PCGamingWiki page.
A common pain point involves the game failing to launch or hanging during "Network Connection" checks. Kingdom.Hearts.HD.1.5.and.2.5.ReMIX.Network.Fix...
If you're on the Epic version, corrupt internal cache can cause the game to fail. You may need to manually clear the EGS cache folder to restore functionality. For more detailed troubleshooting, you can check community
Set the game to Windowed rather than Borderless or Fullscreen. You can then use tools like Borderless Gaming to fill the screen without triggering driver crashes. For more detailed troubleshooting