How to remove default paragrah style in rich text editor?

Questions
4

I think it disappeared after I made the other documents become a child of homepage.

The image shows the Content Management System Umbraco with a focus on creating new content under the "Homepage" section, offering options like "Overview Page", "Login", "Regular Content Page", and "Simple Content Page". (Captioned by AI)
The image shows the Content Management System Umbraco with a focus on creating new content under the "Homepage" section, offering options like "Overview Page", "Login", "Regular Content Page", and "Simple Content Page". (Captioned by AI)1894×935 106 KB

This image shows the structure settings for a homepage in a content management system, where administrators can define allowed child node types, allowing content of specific types to be created beneath the homepage. (Captioned by AI)
This image shows the structure settings for a homepage in a content management system, where administrators can define allowed child node types, allowing content of specific types to be created beneath the homepage. (Captioned by AI)1903×888 144 KB