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In the dialog box, click Add Files, choose Add Files, then select the files
The Loupe Tool window displays a magnified portion of the PDF that matches the area in an adjustable rectangle on the document paneResize a page to fit the window To resize the page to fit entirely in the document pane, choose View > Zoom > Zoom To Fit Page
To resize the page to fit the width of the window, choose View > Zoom > Fit WidthPart of the page may be out of viewTo resize the page to fit the height of the window, choose View > Zoom > Fit Height
Part of the page may be out of viewTo resize the page so that its text and images fit the width of the window, choose View > Zoom > Fit Visible
Part of the page may be out of view
Note: To see keyboard shortcuts for resizing the document, open the View > Zoom menuTo decrease the magnification by one preset level, Ctrl-click the Marquee Zoom tool
The Continuous Zoom or Dynamic tool zooms in when you drag it up the page and it zooms out when you drag downIf you use a mouse wheel, this tool zooms in when you roll forward and zooms out when you roll backward
Zoom In and Zoom Out buttons change the document magnification by preset levelsThe Zoom Value option changes the page view according to a percentage you type in or select from a pop-up menu
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Source:online pdf editor