This question has been asked so many times, and i have viewed every answer in this meta, and outside.
Still none are functioning in Wordpress 4.9.5 (latest version). The enhancement asked 3 years ago is still waiting: https://core.trac.wordpress.org/ticket/34136#ticket
How to remove the Custom Post Type slug name from the url, without creating issue to previous posts or pages?
I've tried the following solutions: https://wordpress.stackexchange.com/a/204210 - 404 page https://kellenmace.com/remove-custom-post-type-slug-from-permalinks/ - 404 page http://www.codeinhouse.com/remove-slug-from-custom-post-type-in-wordpress/ - 404 page