3dmod displays its help with html files in Qt Assistant. If you set this window to your preferred size, it should come up at that size in the future.
Info Window menu and controls, hot key, and mouse actions:
3dmod image display windows:
3dmod dialog boxes:
Model view dialog boxes:
Info window menus
Info window controls
3dmod hot keys
Model view menus
Model view hot keys
Model view mouse actions
Zap Window
Multi-Z Window
Slicer Window
XYZ Window
Locator Window
Tumbler Window
Graph Window
Pixel View Window
3dmod startup window
Model header dialog
Scale bar dialog
Object Edit dialog
Surface/Contour/Point dialog
Contour joining
Contour moving
Contour breaking
Contour copying
Image movie control
Image processing
Rescaling images
Fine grain display control
Slicer angle storage
Bead fixer
Auto contour
Cache filler
Line tracker
Model view object edit
Model view controls
Object List dialog
Image view dialog
Isosurface view dialog
Model movie & montage control
Model movie sequence dialog
Model edit
View edit
Depth cueing
Stereo