(This question is more about trying to learn how Dorico thinks, rather than how to perform this operation.)
Thanks to this (older post) - Remove/convert pickup meaure without moving music - I discovered that I can delete a pick-up bar in (at least) two different ways:
Click on the opening time signature (ie, at the beginning of the pick-up bar), and enter the number of beats that would constitute a full bar in that time signature (eg, “3” in 3/4); OR
Same as above, but enter “0” beats.
In both cases, the pickup bar disappears – the system track numbers the starting bar as “1”, not “0” – and the number of remaining bars seems to stay the same as before. In other words, the pick-up bar is deleted entirely, and not transformed into a new, complete bar, regardless of whether we’ve added or deleted beats in that pickup bar.
How is it that both adding beats (to make a full bar) and deleting beats (to rid the pickup bar of any beats) produce the same result?
Thanks, in advance, for your help!