Setup breaks on your booking page
If you don't want to take bookings all day long, you have a couple options to break up your availability.
Use the break feature
The break feature in YouCanBook.me apply the same break time across all the days you're available for booking. It will also remove those times from your booking page.
Use the break feature if you have:
◦ A lunch break you take everyday
◦ You want an extended break between your morning and afternoon availability.
Under Times & availability > Availability, click Add break to set a break covering the times you don't want to be available for booking.
Block times directly in your calendar
Any busy event on your linked calendar during your set working hours will be greyed out on your booking page. This method works well if you want to take multiple breaks in a day. If you find busy events are not being blocked on YouCanBook.me, check that you don't have units per slot enabled.
Use Custom Availability
Finally, you can use Custom Availability. This allows you to set very specific times when you are free within your set working hours. This is great for frequently changing availability. Details on how to set it up can be found here: Setting up Custom Availability.