SELECTIONPREVIEW
Determines whether a preview displays when selecting entities. When turned on (set to 1 or greater), entities that would be selected if the user clicked the mouse are highlighted. The value can be any combination of the following:
0 = Off
1 = Selection preview is on even if no commands are current
2 = Selection preview is on if a command prompts the user to select entities.
Note: Currently values 1 or greater are treated as if the value is 1.
Type: Bitcode
Saved: In the registry
Range: 0, 1, 2, or 3
Default: 0