Thank’s for answer BUT it still doesn’t work or perhaps there’s a misunderstanding
This search form ‘livres” must be ONLY related to books CPT nothing else, no pages, no posts,
as you see in screenshot below it show results related to other categories and tags, from posts and other CPT
https://videos.beithazohar.com/kpu57wQP
This search form must only provide results for BOOKS, nothing else
Thank’s for support