I adjusted the icon placements on v18.1.91.
If the issue is not resolve, can you please send me a screenshot and what options did you choose in the Tab page of the Customize dialog box.
Thanks!
BTW 1:
In “Compare” menu, “Compare A with B” item is ticked when enabled.
** But “Synchronize Scrolling between A and B” item is not ticked when enabled.
BTW 2:
Turn on Compare or Synchronize first.
Then turn on ReadOnly.
** Compare/Synchronize is turned off.