Please note : This help page is not for the latest version of Enterprise Architect. The latest help can be found here.

Lock Diagram

If User Security is not enabled, to protect a diagram against inadvertent changes such as moving or resizing elements, you can lock the diagram. If you or any other users select any object on a locked diagram, the object's border or outline displays in red.

Lock a Diagram



See also


Open the diagram to lock.


Right-click on the diagram background and click on the 'Lock Diagram' menu option.


  • This does not apply in the Corporate, Business and Software Engineering, Systems Engineering and Ultimate editions if User Security is enabled; in this case, see the Lock Model Elements topic
  • To unlock the diagram, select the 'Lock Diagram' menu option again

Learn more