To remove the Footer Widgets Area, follow the steps below:

From your WordPress Dashboard, go to the Appearance > Customize > Footer > Footer Widgets section.
Switch off the Enable Footer Widgets .
Click on Publish.

It is shown in the image below:

If you want to remove Footer Widgets Area from some of the pages only, refer to this article: How to show or remove the Footer Widgets area from an individual page? (Pro)
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