How to remove a single magnetic flux tube

An individual magnetic flux tube may be removed by using the flux tube contextual menu displayed when the user clicks the right hand mouse button on the flux tube. If the flux tube has been previously locked, it must be unlocked in order to allow its destruction.

Alternatively, a flux tube may be removed by using the removal button, , located on its own toolbar menu. If the flux tube has been previously locked, the remove button is disabled and the fluxtube must be unlocked in order to to enable it. 

How to remove multiple magnetic flux tubes

All unlocked flux tubes belonging to the same magnetic field model may be globaly destroyed clicking on the Clean  button located on model's own toolbar.

Warning: Using the global cleaning tool, all unlocked field lines are also removed from the model.