More information is needed about the system - is this a laptop or a desktop? What other GPU(s) does it have (or do you believe it to have)? Are their drivers installed? What is the output of
Code:
xrandr --listproviders
By default, provider 0 (the first provider) will be selected, but you can modify this behavior by prepending DRI_PRIME to whatever application (and Steam will accept this in application launch options as well) and select an alternate GPU.
See information about PRIME for more information:
https://wiki.archlinux.org/title/PRIME