Dear friends, in bar [52] I simply want to have a 6/4 bar. My questions: 1. Why accept bar [52] only 5 quarter notes, but not 6 quarter notes? 2. Why is the number of the bar [52] and not 53? Thanks!
You should engage Insert mode (I) before creating the 6/4 time signature.
Without insert, Dorico will only redistribute the existing musical time up to the next time signature (your 4/2). It will not add more time. In this case creating a pickup bar with 5 beats. This is also why the bar number is [52], showing you that it is a pickup bar.
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