I am using Kicad 5.1.9 with macOS Big Sur. I have installed the library in both /Library/Application Support and ~/Library/Application Support. I did this and I tried setting the paths to first one path and then the other to see if it would fix my problem. It did not. With the paths set either way I still have no symbols.
The path variables don’t work so that KiCad woul just search for libraries there. All libraries must be added to a library table. Library tables may have those variables. KiCad replaces the variables in the library tables with those defined in Configure Paths.
So, you seem to have an empty symbol library table file /Users/clark…, see the Symbol Libraries window in your screenshot.
The official KiCad libraries should have up to date library tables with them, they are just files in the library folder. You can for example copy them to your Preferences, replacing the old ones.