Use split-window view
Using the Split commands, you can view a document with the document pane divided into two panes (Horizontal Split and Vertical Split) or four panes (Quad Split). While viewing a document with split windows, you can scroll though pages, adjust zoom level, or jump to a specific page in one of the panes independently.
Create a type of split view
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Open a PDF file and choose View > Window.
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Select a Split command as needed:
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Select Horizontal Split 
to horizontally split the view into two. Alternatively, drag the small, grey rectangle box just over the top of the vertical scroll bar down.
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Select Vertical Split
to vertically split the view into two.
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Select Quad Split 
to split the view into four panes.
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Click and drag the splitter bars up, down, left, or right to adjust the size of the panes.
To adjust zoom level of each pane
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In Horizontal Split view, click a pane to make it active and change zoom level for the active pane only.
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In Vertical Split view, change zoom level for the active pane.
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In Quad Split view, change zoom level for the active pane only.
To scroll a document
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In Horizontal Split view, click a pane to make it active and then scroll the document in the active pane only.
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In Vertical Split view, scroll the document in the active pane.
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In Quad Split view, scroll vertically to change the view in the active pane and the pane beside it. Scroll horizontally to change the view in the active pane and the pane above or below it.
