Switched to Flexbox. Ruined site. :(

I switched to flexbox in Customizer, but I wasn’t expecting not being able to switch back if I needed to. Now my product category pages and single product pages are all shifted to the left and I cannot figure out how to fix them. It was full width, but now when editing these pages, a huge space on the right side is insurmountable. Is there any way to go back to floats? Is there a way to fix this without switching back? So confusing.

The page I need help with: [log in to see the link]