Switching themes on a site with hundreds of pages deserves a check first. Theme Switch Audit is a separate free companion plugin that scans every page and post for what the old theme left behind: shortcodes, templates, widgets and settings that will not carry over.
On a site with a thousand pages the raw list is too much, so an AI explainer turns it into a short plain English digest with a needs-a-look column. Run it before you switch anything important, then switch the theme knowing exactly what to fix.