Hello,
After checking your website configuration, the issue is related to the Archive Product Layout settings.
Currently, the search results page is excluded from the archive layout where the sidebar filters are added. Because of this exclusion, the sidebar (and its widgets) cannot appear on the search results page.
Please remove the condition that excludes the Search Results page from the Archive Product Layout
Use the layout for all archive pages, including search results
Once this condition is removed, the filters sidebar will appear correctly on the search results page.
Best Regards,