You can delete messages from sequence diagrams or delete them permanently from all diagrams and projects. When you delete a message, you have different results depending on the type of message that you delete.
To delete a message, in the diagram editor, right-click a message; then click Delete from Diagram or Delete from Model.
Parent topic: Developing messages
Related concepts
Messages
Related tasks
Creating synchronous or asynchronous messages
Adding create or destroy messages to lifelines
Delaying the receipt of asynchronous messages