C1FlexViewer allows you to manage the zoom behavior of the previewed document in the FlexViewr control. To specify the preview zoom mode, you can use the ZoomMode property. The ZoomMode property accepts the following values from the FlexViewerZoomMode enum, which describes the zoom modes supported in the FlexViewer control:

• Actual Size: Shows the pages in their actual size. This is the default setting of a document when opened in FlexViewer.
• Page Width: Fits the page to the width of the preview window.
• Whole Page: Fits the whole page in the preview window.

In view modes, you can also choose from the different display options of the previewed document. To specify the display options, you can use the PageDisplayMode property. The PageDisplayMode property accepts the following values from the  PageDisplayMode
enum, which describes the different display modes supported in the FlexViewer control:

• One Page – Shows the pages, page by page, in a single page view
• Two Pages – Shows two page view of pages
• Four pages – Shows pages in 4x4 mod