In the View tab of the Options... dialog, check Show thumbnail images.
Check this option to turn on graphical thumbnail images in the chapter indexes for graphics, AutoCAD, MicroStation and PDF drawings.
Graphics chapter index pane without and with thumbnails shown
Thumbnails for the graphics in your system are generated during the DBDOC project build (and cached on the build machine). Thumbnails are not generated for regular CAD/CLD diagrams, nor for text documents (except for PDFs). Clicking on a thumbnail (like clicking on document title hotspot above it) will cause that graphic to be displayed in the content pane. Right-clicking on a thumbnail shows a popup menu that allows you to mark the graphic for printing, or to rotate it.
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