Select Edit Ticket Information in your page builder.
You've got two options for tracking capacity.
Option One: Set an event capacity
This will count all of your ticket levels towards one capacity. It won't matter how many of each level is sold with this setting, it will close sales when 1000 tickets total have been sold.
Option Two: Set ticket level supply
This will cap ticket sales per ticket level when each individual capacity is reached.
Publicly display remaining inventory
This will show the number of tickets remaining on the live page:
Exclude from capacity
If you've used the event capacity option, this won't count this ticket level towards the number set.
How does the event capacity work if it's a multiple event, multiple date, or recurring event?
In this scenario, the event capacity is per event, per date, and per recurring event.