The section is inside the site container, so Unfortuanly it can not be full width without the whole page being full width.
Alternatively you could try another method by using our plugin Generateblocks.
https://wordpress.org/plugins/generateblocks/
In the page editor make this page full width, add other contents in to Container blocks, set those block width to contained.
Add the sticky section into another container block and set its width to full width.
Let me know if it helps 🙂