I tried it again a few days ago and this time the mapping page stayed put.
Again, so many details in learning a new program (I’m a Studio One ex-pat) that they sometimes get lost in the mix/shuffle/kerfuffle.
I’m still not entirely sure what the import and export script features are for in the MIDI Remote section if you can just pull those script files directly out of the documents folder on a Mac or PC. My imports certainly didn’t seem to work, but then again, I’m not claiming expert status. 