To Use Feature Creation Preview
While creating a feature, click one of the following icons to toggle the Preview mode:
• 
No Preview
No Preview• 
Dynamic Unattached Preview
Dynamic Unattached Preview• 
Dynamic Attached Preview
Dynamic Attached Preview | For sketch-based features, while in Preview mode, you can toggle the display of sketch dimensions and their draggers. Right-click the graphics window and select Show Section Dimensions or Hide Section Dimensions from the shortcut menu. |