For Step 1, if I click the Location Metadata set, I do see the location information filled in. That's helpful, in and of itself, actually!

But for Step 2, when I switch back to the Default metadata set and click Customize, I don't see any location fields to add. I have the Basic Info and Camera Info collapsed, but I don't see anything under either of those dealing with location. Not sure if Step 2 is a pre-req for Step 3, but...

For Step 3, that sounds like what I want! But I edited the prefs file and it doesn't seem to stick. I made sure LRC was closed, modified the prefs file, and started LRC. Info line #3 just displays blank. The "City" metadata seems to be populated, FWIW.


"But I edited the prefs file and it doesn't seem to stick. I made sure LRC was closed, modified the prefs file, and started LRC. Info line #3 just displays blank. The "City" metadata seems to be populated, FWIW."
Your screenshot shows the problem: in the City field, "Monterey" is italicized, which means it was provided by LR's automatic address suggestions. When address suggestions were introduced, the implementation was botched, with some parts of LR treating suggestions the same as if they were typed by the user and other parts treating them as blank:
https://community.adobe.com/t5/lightroom-classic-discussions/lightroom-inconsistent-handling-of-suggested-addresses/m-p/12663467
The workaround is to "commit" the suggestions (see that bug report for how to do that efficiently). I do that as a matter of course, so I didn't notice the issue with Loupe Info.
I'll update the bug report.