Modifying the height of a segment
The segment or extension height can be adjusted for all bar types.
Notes
Do not set the segment below the red line displayed on the cylinder.
For Hader bars, use the Minimum distance to tissue option from the Bar parameters 
.
Double-click the prosthesis in the visibility tool to make it transparent.
Click Lock 
on the Front button.
Tip
Consider using the Make segments parallel and the Align segments with model options from the Bar parameters .
Use the segment or extension handles to move the segments into position.
Tip
Using the middle segment handle will allow movement of the segment without changing the rotation/tilt of the segment.
Use the 2D cross-section view to validate the distance between gingival surface and segment/extension and overdenture.