WordPress Shop Layout Fix

My shop page has lost its two-column structure and is now pushing everything into one full-width column. I need it restored so that a sidebar (left or right, whichever the theme supports best) holds my usual widgets—product filters, categories, and any other native Woo sidebar elements—while the opposite column cleanly lists the products in the standard grid.

The task is mostly front-end: adjust the template file or theme settings, tweak CSS if required, and keep everything responsive. No core edits please; if a child theme override or hooks are needed, build them properly so updates won’t overwrite the work.

Deliverable: a WordPress shop page that loads with the sidebar in place and products displayed neatly beside it on all modern browsers and mobile breakpoints. Once it’s working, just point me to any settings you touched so I can manage them in the future.