Sections allow you to organize and present content in different formats, layouts, or media types. Arranging content into sections gives site creators design flexibility and also gives the site visitor guidelines to better navigate and understand the site. There are different section types that can be used in a page, you can check this article for more information.
To delete a section:
1. Select the section that you want to delete.
2. Click the Trash Bin icon on the upper right corner of the section.
3. Select the Delete Section button in the dialog box that comes up.