3 Run 13.1 - how to set to 12 weeks

Hello- I began the 3 Run 13.1 training plan- the primary description says it is 12 weeks long. Only several weeks in did I realize the detailed description says 12-16 weeks, and the app automatically populated to 16.

My race is 4 weeks sooner than the app is mapping me for, so I need to jump forward 4 weeks to be on the appropriate training level. How do I adjust my end date for this plan? My race is 2nd week of February so it’s getting very important to be on the correct distances. Thanks!