In Unified Modeling Language (UML) sequence diagrams, you can move a lifeline to reposition the instance’s activity in an interaction frame. Although the horizontal order of a lifeline does not have semantic value in the project, you can move the lifeline horizontally to position it in a location that makes the diagram easier to read.
Parent topic: Developing lifelines
Related concepts
Lifelines
Related tasks
Creating lifelines
Deleting lifelines
Specifying class names and types for lifelines
Terminating lifelines with stop nodes