I often have this issue with Dorico creating groups empty groups - labeled MIDI Import, even though nothing has been imported. In this example I recorded all the stuff INSIDE Dorico. Isn’t it possible to upload a pic.?
It is certainly possible to upload a picture; if you can’t upload files, you may need to check any third-party browser extensions you are running, as some privacy-focused extensions can break some forum functionality.
Dorico creates player groups as part of the MIDI import process, but you can disable this if you like: the options are found in the lower section of the MIDI Import Options dialog, which you may have to manually disclose/expand.
The funny thing is, that I never imported anything!! As I wrote in my Q, I have recorded MIDI into D.
I have send you an e-mail.