All design happens within constraints; constraints behave like evaluation models and change the geometry of diagrams. Sometimes constraints do not apply to some systems, so as a project administrator you can turn on or off the constraints calculation depending on how you want to setup the project. By default, constraints if added are enabled on all systems.
In the “Manage Systems” panel, click on the “Constraints” link.
Select if you want to turn the constraints calculation on or off.
Note: Turning on constraint calculations means that the computation will be slower thereafter by about 20%.