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.
You must have a sequence diagram with lifelines
open in the diagram editor.
To reposition a lifeline, in the diagram editor, click
a lifeline and complete one of the follow steps:
- To
move the lifeline left or right, drag the selected lifeline horizontally
to a new location in the interaction frame.
- To reorder the lifeline, drag the selected lifeline horizontally
across other lifelines to a new location in the interaction frame.