How do you turn off "use score drum map"

When I import a midifile, Cubase decides some tracks are going to be set as “use score drum map”, I don’t always want this, but how do you tell the score that you don’t want it to be a score drum map, because in score settings - Staff - Option, the “Use score drum map” is ticked, but it is greyed out, so you cannot change it.

I always select a new score preset, such as Violin, which takes it back to normal, then edit from there, but there must be an easier way - but how?