Quickly add breaktime from calendar and where to delete it
You can add breaktime from Calendar using "Add breaktime" mode. Switch to "Add breaktime" mode and click on the timeslot you want to make break time.
In the breaktime settings popup choose whether you need to add common breaktime or only breaktime for specific provider(or service if you switch to Services view)
If you added common breaktime, it is saved and you can remove it in Time settings//Company special days (date marked yellow).
If you added breaktime for certain provider, it is saved and you can remove it in Time settings//Providers schedule//Special days tab// select provider from drop-down and see special days for that provider (marked red).
If you added breaktime for certain service, it is saved and you can remove it in Time settings//Services schedule//Special days tab// select service from drop-down and see special days for that service (marked red)
Add breaktime for everyone
If you wish to add breaktime or day off for all providers/services, you can also do it in Time settings//Company opening hours (for weekly schedule) or in Time settings//Company special days (if you need to add it only for particular date).
Use 
"add breaktime" icon to add breaktime or 
remove breaktime icon to delete it.
Add breaktime only for certain provider/service
If you wish to add breaktime or day off for certain provider, you can do it in Time settings//Providers schedule (for weekly schedule) or in Time settings//Providers schedule//Special days tab (if you need to add it only for particular date).
If you wish to add breaktime or day off for certain service, you can do it in Time settings//Services schedule (for weekly schedule) or in Time settings//Services schedule//Special days tab (if you need to add it only for particular date).