1. Go to Company - Shifts - Shifts
  2. Highlight/click on the shift group in question
  3. Click Edit next to the shift to change within that shift group
 
Change the Lunch or Break Duration (Web) Image 1
 
 
        4. Click Edit next to the Lunch/Break you want to edit
 
Change the Lunch or Break Duration (Web) Image 2
 
        5. Change the duration to desired duration and Click Ok.
 
Change the Lunch or Break Duration (Web) Image 3
 
For more info on Lunches/Breaks see this article.