You can view multiple documents in a single Document window by using tabs to identify each document. You can also display them as part of a floating workspace, in which each document appears in its own window.
Open a tabbed document in a separate window
Right-click (Windows) or Control‑click
(Macintosh) the tab and select Move To New Window from the context
menu.
Combine separate documents into tabbed windows
Change the default tabbed document setting