These window panes can be hidden or un-hidden from the View menu
(or hidden by clicking the ‘X’ on its pane).
These windows are mostly usable to the application as they provide
a real-time view into the active document.
If closed, they can be re-opened here.
An example to get more screen real-estate is to fix the Flags
parameters (see Flags Pane), then hide the pane.
All settings are persistent across application sessions, so if panes are missing
this menu is a good place to check if they are hidden.
(See also Menus)
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