Hi @David_Menke, and welcome back to the Forum.
And yes: I love Cubase’s Track Visibility Agent, but in Dorico there are ways to have a similar result:
you can easily (in Write mode) Select all (or select a desired range of bars using the System Track) then Filter for notes and Chords, then in galley view, just create a new Instrument Filter clicking on the + in the instrument filter overlay: