Hi Zero_1
In case of caesar default modeller lateral , axial & longitudinal movement is already arrested at the hinge point of expansion bellow. One or two angular rotation is free based on it’s a hinged type of gimbal type expansion joint.
You don’t have to do any more manual setting whenever you are using caesar default.
If you check end point to end point relative movement of bellow you will find vary small amount of changes it’s due to hinge/gimbal rotation. If two or more hinge or gimbal expansion joint is used in same system there will be sufficient movement due to same reason.