While adding the data for the staff or creating a new staff member, we enter their name and details and further we allot them break timings.
Once the listing of the staff is created now proceed to action
1. Go to Setup >> Manage Staff
2. Click on Three dots (...) >> Edit
Under the Edit option, you can update their information, Also add their breaks day wise.
3. Go to Breaks
4. click on Add Break to add break for particular day.
Also, here is the video tutorial for your reference