I started with the big band template. Instead of bass trombone, there will be tuba. I have tried the documented procedure: setup->players select the three trombones and the tuba and then ‘add group’ . No luck.
If I create a bass trombone player, and move it below the 3 trombones it gets properly braced (and I presume added to the group). Strange things start happening if I add tuba to the bass bone player. I open a new score jazz->Big band. I add tuba to the bass bone player. Switch to write mode. Trombones are properly bracketed together in page view. Switch to galley view, enter one note in the tuba part. Switch back to page view, and the bracket now only covers the three trombones, tuba is on its own. Is this a bug?