I know, but your very first post in that thread is
Haven’t we presented many different circumstances where we need to hide these items in this thread? Sure, some of these are possible with flows, but if I have an 18 page II-V booklet like the above, where each pattern takes up 4 systems, and I have 50 patterns, that means I need to create 200 separate flows in Dorico?! That is terribly inefficient for something that is one-click Select All / Hide Cautionary Clefs, Key, and Time Signatures in Finale. Obviously you disagree, but we have presented many different real-world circumstances where this ability is needed here. Perhaps you will come up with a more ingenious way of a implementing a solution to these situations other than a simple Hide command, but I do hope some sort of solution is being considered.