The Booking Spaces field selects whether your Business offers a single spot for each Booking, or if Bookings have spaces for multiple attendees.
From the Dashboard, click the Cog/Settings icon.
Click Dept Settings.
Click Change next to the Booking Spaces field.
Select the desired option, then click Save.
While configuring a Service, enter the desired amount of Spaces into the Spaces field to adjust Booking Spaces.