Adding a Full-width section to your SharePoint page makes the page look more user-friendly and attractive to showcase the important layout events information. Now the full-width section only supports 3 web parts of SharePoint online which are the Image web part, Hero web part, and Countdown Timer web part, maybe in future updates, it may support multiple web parts.

Steps to add a Full-width section to your SharePoint page.

This is how you add Full-width Section to your SharePoint Page.