After doing some editing on divisi in the first violins on this page in the screen shot, the bracket for the strings changed, failing to embrace the top violin line. I try to fix it by dragging the handle, but it keeps snapping back. I also tried deleting it and inputting a new one, but it behaved the same way.
I also notice that the Properties panel has nothing in it when it comes to these brackets and sub-brackets. Perhaps eventually we might be able to control the brackets from there, e.g. be able to indicate which and how many staves a bracket covers, and being able to change their width and position relative to the barline?