You can lengthen/shorten custom barline joins vertically to change the staves across which they span; for example, if you added a new player below a barline join and want to extend the barline join to that staff.
Prerequisite
Graphic Editing is selected in the Engrave toolbox.
Procedure
Result
The selected barline joins are lengthened/shortened to staves above/below. This affects the staves included in the barline joins on all systems to which the corresponding bracket and barline changes apply.
Only one barline join can exist on each staff, they cannot overlap. If any part of a selected barline join collides with another barline join when it is lengthened/shortened, the other barline join is shortened to accommodate this.
You can undo this action, which restores the previous length of any shortened barline joins.