Spliting Master Score

I have created a master score, includes a Tenor Part, a bass part and keyboards
Under MuseScore3, I could create separate scores from the master, one that included Tenor & bass on the same score and one score with the keyboards (see the attached files)

Export is not doing that. Even when I tell it to export Tenor & Bass parts and select All Parts combined in one file, it creates a separate score for Tenor and a separate score for Bass. They are both in the one file, but still separate scores. I need a combined Tenor & Bass score, like I used to be able to create