Main Toolbar > Crossing Selection or Window Selection from the Window/Crossing toggle
Edit menu > Region > Window or Crossing
The Window/Crossing Selection toggle switches between window and crossing modes when you select by region.
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In Window mode, you select only the objects or sub-objectswithin the selection.
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In Crossing mode, you select all objects or sub-objects within the region, plus any objects or sub-objects crossing the boundaries of the region.
Tip: If you're making sub-object selections of faces and you select more faces than you want, make sure you're in Window mode.
The Selection Region flyout on the toolbar allows you to create different-shaped boundaries.
Autodesk VIZ automatically saves the Window/Crossing setting in the 3dsviz.ini file.