Editing and adding new Javascript to studio API documents


I need to add some feedback button and other java script to my Studio document. Can you please guide how to use it before publishing(similar to Stoplight Next).

Also, I need a link to the page which explains how to change existing details on the studio GUI like tab name from “Docs” to “API description” or something.

Another thing I want to understand is the process to remove the path details from the subheading of the endpoint.