It’s just a command; you type it into your terminal like this:
garuda-inxi
It has useful troubleshooting info like hardware specs, etc. At the moment, we don’t even know what desktop environment you installed. It is typically helpful to have some basic information to refer to.
You can edit your first post to add the inxi output in.
I’m not sure I follow what you are saying but check and see if it is this issue: