If YOU came across, because of the same question…
…and because there is no Reconfigure button…
…and because there is no Remove Tuner button (to execute the initial Tuner Setup again)…
If everything went well, you can restart doing the initial setup as described in my first post and repeat until you found the right combination of the Tuner Setup - Awkward but it works
@PlexDev: Please be so kind to add a proper RECONFIGURE function or at least a REMOVE button (or both?).