...
The Offset Distance defines how much material at the front and back surface will also be defined as interface regions. In case of a sleeve for a screw not only the inner cylinder is important but also the front face where the screw head is connected to the part. This front face is also a functional surface and needs to be applied with an Machining Allowance.
...
Note: When the interface thickness ≥ offset distance then the interface volume will be hidden in GUI due to a current limitation. The optimization will still consider the entered values and the Print Geometry will consider the entered Machining Allowance value.
...