The prior response to my similar question was: "The default Opus 12 toolbars use this command to toggle the dual view on and off: Set DUAL=Toggle,Vert,Remember,ToggleLayout The Remember part of that will remember the folder which was open."
I d not understand how to set DUAL= Toggle, etc.
Can someone explain this procedure? Is there a button I can click on that will do this?
If you're using the default Opus 12 toolbars, there's already a button for this near the top right. Look for these icons (which split the window vertically and horizontally):
If you're using toolbars from an earlier version, you can either reset the Menu toolbar to factory defaults or edit the individual buttons to add Remember to them.