Hello Can You Help?
I wish to be able to change the layout to full screen instead of a narrow template in the centre of the screen, but I'm not sure how too.
Also, I have been trying to add blocks (headers and footers) to the template but this crashes the page and I have to deactivate and reactivate the forum plugin!
Is there a specific way to add additional blocks along with this forum plugin?
All you've mentioned are out of wpForo scope. They should be configured from your WordPress active theme. Try to edit the forum page and find the page template settings. If there isn't any, contact the theme support and ask them to help you customize the full weight template.