Finale 25.4.1.152 Windows

I have an old score that I need to update. It was first created in Finale 2006. I opened the score in Finale 25.4.1.152, saving it to a .musx file (all in Windows). So far, so good. I did some fixups to the parts (split Trombones 1&2 into separate parts, added Baritone TC from the BC part, etc.) and generated the parts. Now I've made some changes to the score and am noticing the changes are only showing up in the parts in SCROLL view, but not in PAGE view.

I've tried selecting all the music on a part (in page view) and then using CTRL+U (Update Layout), but the page view doesn't show the changes. Is there a way to get my changes from the score into the parts without having to regenerate the parts from scratch? (There's a TON of editing I have to do to get the parts looking presentable.)

If you need additional information, please let me know. Thanks!