View a document in multiple windows
You can create multiple windows for the same document using the New Window feature. The current document is then copied to a new window that retains the same page layout and magnification level.
When you create a new window, the file name of the original window is given a suffix”:1” and the new window suffix”:2”. If you close one window, the remaining windows are renumbered sequentially.
For example, as demonstrated below, there are four windows from the same document. If you close the second window PDF Learning Guide: 2, the remaining three windows are automatically renumbered in order. You can close multiple windows without affecting the original window as long as there is more than one window open.

Closing one window and the remaining three windows are renumbered
To open a new window
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Open a PDF file and choose View > Window > New Window
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A new window displaying the same page pops up on top of the original window, with the suffix:2 added to its file name. Repeat clicking New Window to create more windows for the document.
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You can click the close box to close the window. It does not close the original window as long as more than one window is open.