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Right-clicking in the image area of the window also provides access to the menus. Other windows that are accessible on the "Window" menu such as the "Console", which provides python scripting access to "it" are not dockable and appear as top-level windows.
Preferences Window
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General
Save Sessions
Controls whether "it" session data should be considered valuable. If turned on, a save dialog will be presented when image catalogs are closed.
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