How do you select all the notes in a row in the Drum Editor?

Is it possible to select all notes in a row in the Drum Editor, just as you can in the Key Editor?
In the Key Editor, you can do this by selecting a note on the piano roll while holding down the CMD key (Mac) and clicking the mouse.

When creating a drum map in the Drum Editor, all notes are displayed, even if they haven’t been assigned. Is there a way to hide them from the start?

Hi,

Shift + double-click on the 1st note of the given pitch. All the following notes of the sama pitch becomes selected.

The same works also in the Key Editor. This way, you can also select all following Parts/Events in the Project window.

I had been looking for that shortcut for AGES !!
Finally …
But I think since it is not an intuitive shortcut, there should be a Feature Request, to add CTRL / Cmd click on the left hand side of the Drum editor on the pitch value name itself to enact the selection.
But thanks anyway Martin for that useful trick.