Where can I find it? Company >>> Components/Integrations >>> Season / Maintenance closer.
Close all your services
Select a date and click on "Close".
Click on Date | Time range to deploy the time range fields. Fill them as needed and then, click on "Close".
You can set up exceptions for certain services. Ex: you have 6 services and you only want to close all services except P2, so in the "Close all services excepting" field, enter "P2", and then follow either the first option or the second option to close.