When we zoom in/out lister, zoom don't refresh horizontal scrollbar.
We need to resize tree or Lister to display/hide scrollbar.
It refreshes OK here. (Opus 11 Beta 3, Windows 7, and Details mode.)
Thanks! I've reproduced it now. It was difficult to notice with the columns and settings I had, but turning on full-row selection (and also a right-aligned column like Modified) makes it obvious what's going wrong.
We'll get that fixed.
This has been fixed for the next beta.