How to add MIDI Note to custom percussion map?

Dear advanced users,

I could not find a way to add MIDI notes into Drum Kit Note Map.
How to do it?
Sorry if I missed something in the forum.

Best regards,

Click ‘Show all’ in the action bar, which will show all of the MIDI notes, rather than only the ones that already have a mapping.

Ah, thanks!
“Show all” is also a button!