If you want some text for a particular bar in your full score but not in the parts, it’s crazy making to add system text and then go through each of the parts and hide it.
My “solution” is to add the text to the topmost part, and then hide it in that part. If need be I can shift it around a bit in Engrave.
This is a bit of a kludge. Does anyone have a better / different solution? Text frames are no good, since they are not linked to the bar.