Arch - installed Heroic/Mangohud via pacman, can't get games to boot with mangohud enabled?

Hey,
Recently switched my primary desktop to Arch. I've installed HGL to play Epic games and I want to use mangohud in game.
I have my prefixes configured to Auto Install DXVK-NVAPI, I have Enable Mangohud checked.
Mangohud is installed on my system, but I can't figure out how to bring it up in game.
What am I missing here?
Thanks.
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