I want to create a worksheet with a single-line-staff (-> image) without changing a instrument to percussion. I can’t find any tutorial. I’m using Dorico 3.

Yo can’t edit the staff type independent of the instrument that uses it.

But you don’t need to get into the (relatively complex) process of setting up a drum kit etc to do this. In setup mode, just add a single-line percussion instrument (e.g. a triangle) to the worksheet.

Ah, okay. Thanx!