konsole split pane grip separator border size

Is there a way to make the border between split view konsole panes thicker? With the Breeze theme I have a very thin dark line. Not very good.

I think this is part of the desktop theme you’re using, not something easy to edit in plasma.
I have a nice dividing line using oxyzone in LEAP 15.1 (you have to download it from inside systemsettings). YMMV