Under MIDI file export, the “export inspector patch” and “export MIDI inspector volume/pan” tick boxes are greyed out. Even under Preferences → MIDI files these options are greyed out. I have not found any solution online to activating these. Even in a picture in the Cubase operational manual these two options are greyed out, but the manual does not take any notice of this.
I found the solution by accident: if you have “export sends” or “export inserts” enabled, then the “Export Inspector Patch” and “Export Inspector Volume/Pan” becomes deactivated. Solution is to disable “export sends” and “export inserts”. Apparently you can’t have both.