Each section is set to "normal position" by default, which means that it is displayed in the natural order of the sections. You can change this in the section settings.
Other options are most often used for positioning the section that includes page navigation (top menu).
Click on a section, go to its settings in the inspector.
You can choose from 3 options:
1. Normal position
The section takes a normal position in relation to the others, it moves as the page scrolls. The section with navigation is displayed in the natural order of the sections.
2. Fixed position
The section is attached to the top of the page and does not move when you scroll the page. When choosing this item, you should make sure that the background of the section and the colors of the elements it contains are always legible. As you scroll the page, this section will always be stuck to the top of the page.
3. Cover position
The section covers the section below and moves with it as you scroll the page.