MangoHUD

Configuration

MangoHud can be configured just like the instructions mentioned by the project with a few changes:

You can either create a configuration file in: ~/.var/app/com.valvesoftware.Steam/config/MangoHud/MangoHud.conf
Or you can give the flatpak access to filesystem on the host: flatpak override --user --filesystem=xdg-config/MangoHud:ro com.valvesoftware.Steam if you prefer to keep the config file there.