Update as of May 2020, there is an updated way in which to set staff working hours. It is detailed here https://help.cogsworth.com/en/articles/2383581-how-do-i-set-working-schedules-with-many-breaks-throughout-the-day-and-multiple-shifts-throughout-the-week

Simply head to your staff > click on the staff member (could be you) > working hours > custom working hours > then set your different hours for each day and toggle days on and off > add breaks by pressing the + button (this can serve as both breaks and gaps between shifts) 

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