Switching between open windows
Using Switch Windows, you can switch between documents you have already opened. It is especially useful if you have opened a large number of PDF documents and want to quickly switch between them.
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Open multiple files and choose View > Window > Switch Windows
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Do either of the following to switch between open windows:

Switch among the three open windows.
Note: Alt + Tab only works on individual open document windows. Those in Tabbed View will not be affected.