To add phase change lines:
Navigate to the Track screen and click the ellipses
Click Add Phase Change (Graph)
3. In the "Add Phase Change?" pop-up, the Appears After (Date) and Next Phase must be selected.
Please note, if moving out of "Not Specified" --> "Baseline," you may want the date to appear the day before.
4. After clicking Save & View Graph, a line is generated on the graph and will change on the tracking session.