On this link, you can see that the page is not fullwidth, though there are no margain or padding around the images, the grid or the container. hidden link
I have also attached an image (Screenshot 1 and Screenshot 2), how the back end looks and fx the borders and the placing doesn't show up on the live view.
Then also the template shows this error multiple times (Screenshot 2) and when I want to view it in live view, it either just shows an error page or only the non-dynamic parts of the page (Screenshot 3).
The only way to make your blocks full width is if in the Advanced section they have the option for Block Alignment.
If it doesn't then you will need to add a container block and then set the container Block Alignment to full width then add your other blocks inside the container block.
Should the container block not have the full width option then your theme doesn't support it.