Even if you use an ensemble patch, Dorico has no way of knowing what notes in any given chord are producing wind and brass samples and which are producing strings, so I’m not sure that it really matters how you write with such patches in Dorico, since you’ll get no specific assistance in working out how to break out that material onto solo or section staves for those specific instruments.
What composers who like to write in sketch tend to do is start with a smaller number of staves, e.g. a grand staff instrument each for wind, brass, percussion and strings, adding text notes or comments to yourself to remind you of your planned orchestration for each chunk, then eventually graduate to writing with a larger number of staves. This is the process Alan Silvestri, for example, describes in the interview we made with him last year.