This menu controls on what windows the selected regions are displayed
Off: The selection is not shown on any of the plan or surface windows
Main Window Only: The selected region is shown only in the window in which the selection is being made
All Plan Windows: The selected region is shown in all plan windows displaying data sets from the same data file as the window in which the selection is being made.
All windows: The selected region is shown in all plan and surface windows displaying data sets from the same data file as the window in which the selection is being made.