Since the Gutenberg support “Wide” blocks, you can make stretch for AWB in the theme code:
- Enable support for `Wide` blocks in theme. Read here how
- Add this JS code to your theme or in 3rd-party plugin:
Note: this code for example only, your theme may not work with it properly (it may not work correctly with theme sidebars). So, you will need to change this code manually depending on your theme styles.