Nvidia Graphics Filters for Hell Let Loose
Nvidia Control Panel -> Adjust Desktop Color Settings
Adjusting Desktop Color Settings
Use these with filters or without, it is preference and just an option. Adjust to your liking.
Important Note: Filter settings can be subjective and may also depend on your monitor's calibration. Experiment to find what works best for you.
Nvidia Geforce Experience Overlay workaround:
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Browse Local files of Hell Let Loose
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Change Hell Let Loose / HLL.exe to Hell.exe
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Open Geforce Experience: Check that you have in-game overlay enabled, and experimental features ticked
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Click 3 dots top right (refer video) and scan for games. You do not want to see Hell Let Loose in the list