Hi there,
ok so your pages have their page builder container set to Full Width:
https://docs.generatepress.com/article/page-builder-container/
Which is correct if you want to add Containers that have full width backgrounds or content.
Leave that set as Full Width 🙂
Now select a Container Block and look for the Inner Container setting ( in settings sidebar ):
https://docs.generateblocks.com/article/container-overview/#general-options
Change the Inner Container to Contained.
Now your content is contained, but the containers background color or image will be full width.
The main use of multiple Container Blocks is to divide your page into ‘sections’.