I’m using the most recent upgrade to Dorico. Currently imputting a Mass by Jommelli from a set of instrumental parts, so beginning with a single stave for Soprano voice, adding notes, then adding a second stave etc., etc., I’ve virtually finished the opening movement, but when I select ‘organo’ (2 staves) no instrument appears. It will add a piano and a three stave ‘organo’. I don’t know whether this is peculiar to this version - I never tried in the earlier versions. I can use the 3 stave organ part of course - and if I do, is it possible to hide (delete) the unwanted stave?
[Just for info, using instrument names in Italian]