Have to apologize to Nick Simson. He was having more issues than he should have with the webmentions plugin. Turns out that the Block Editor was hiding the option I kept expecting to be there. Will have to come up with a solution for that.
The Definitive Location
No need to apologize, David! Thank you for taking the time to troubleshoot this with me this week. I’m sure the next plugin update will help a lot more users out there.