Support › General › Limit the number of posts?
Can I somehow limit the number of posts the webmaster can add?
Maximum number of post of the Post type "Solutions": 3
Maximum number of post of the Post type "Newsitem": unlimited.
This is beyond the scope of support of Meta Box. You can try to use a third-party plugin to limit posts by user role https://wordpress.org/plugins/user-posts-limit/
Refer to this topic https://wordpress.org/support/topic/limit-post-creation-count-by-author-or-role/
Thanks for your answer Nguyen.