You can set a drawing that will appear as preview in the dialog boxes in which you browse for a project file: File Open, New From Resizable Design, and Import Into Current Project. As default preview drawings, you can select any drawing you want — 1up, 3D model drawing, layout or other.
To set a drawing as preview default
The program places a check mark in front of the command to indicate the drawing as preview default (pictured):
From now on, when you select the file in a browse-for-file dialog boxes (see the introductory text at the top of this page), the program will display the set drawing in the dialog's preview area.