Preview graphql vs Edge graphql playground UI

The preview graphql playground is used to read the unpublished content and the edge graphql playground is used to read the published content.

Here is how preview playground looks

This is how edge playground ui looks

The Url of the edge playground will be same but at the bottom you see, you will have to pass the API Key from deploy.sitecorecloud.io specific to the dev, qa, uat environment.

The url of the preview playground will be different in terms of the hostname. You have to provide the cms hostname for which environment's cms you want to check the preview dev, qa or uat. Also, you need to get the API key, the sitecore item guid which remain in the folder /sitecore/system/Settings/Services/API Keys