Controls the preview behavior when inserting a named or new layout viewport.
| Type: | Integer | 
| Saved in: | Registry | 
| Initial value: | 0 | 
|  
			  Value  | 
 
			  Description  | 
|---|---|
|  
			  0  | 
 
			  Display a rectangular frame only (best performance)  | 
|  
			  1  | 
 
			  Display a full preview image  |