How to make lists full width section in sharepoint?

Unfortunately, SharePoint doesn't provide a way to make the List web part truly full width or remove all of the white space around it. The List web part is limited by the page layout and section type.

Your options are:

• Use a one-column section to maximize the available width.
• Remove or minimize other web parts on the page.
• Link users directly to the list itself rather than embedding it on a page, as the standalone list view uses the available screen space more efficiently.
• Consider customizing the page with SPFx if you need a completely custom layout.

Out of the box, there is no setting to make the List web part span the entire browser width.