Maple documents can be opened in a new window or tabbed pane.
Use the Interface tab of the Options dialog to set up default behavior for this feature. See Options>Interface.
Existing tabbed panes can be opened in a new window.
Ensure that the tabbed pane is active.
From the View menu, select Open Tab in a New Window.
Common Actions, Open, Options>Interface, Switching between Worksheet Tabs
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