Hi @Ronak Patel
The link you provided is the link to the confluence server documentation.
In the cloud, the name isn't "section", but "layouts". And the documentation for that is here: https://confluence.atlassian.com/confcloud/add-formatting-to-your-page-724764836.html#Addformattingtoyourpage-layouts
Take our 5-minute survey to win a $500 Visa gift card! Are you currently using Confluence Cloud? We want to hear from you! Fill out this quick survey about your Confluence Cloud experience so we ...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events