Admittedly I’m doing this in a hacky way, but when I need a hidden barline, I set the dash length to 0 and use a dashed barline.
The problem is that the barline is no longer selectable, unless I change to an explicit single barline and then edit that one.
It would be helpful to show a signpost for barlines when they’re entirely hidden. Not sure if the workaround I’m using means this isn’t the best solution; open to suggestions. Thanks.