Scope

I am not able to see the “Display in Hosted Pages” option, which is not found under the plan. Why?

Summary  

The issue happens when you have enabled checkout access only via API in your site's checkout configuration.

Solution
You can disable the “allow customers to access checkout via API” option under Settings > Configure Chargebee > Checkout & Self Self-Serve Portal.

Please refer to this link for a quick demo video.

Related articles and Documentation
Configuring checkout