Profile: davidR-12

Problem: I would like to limit the number of posts a single User can create with a Form. The maximum number of posts allowed should be only one.

Solution: The easiest solution here is to use a View of these posts filtered by post author, where the author is the same as the current logged-in User. If any results are found, show nothing in the loop. If no results are found, show the Form by replacing the text in the "No items found" block with the corresponding Form shortcode or Form block.

Relevant Documentation:
See the first FAQ here - https://toolset.com/documentation/post-relationships/how-to-create-custom-searches-and-relationships-for-users/#how-do-i-prevent-users-from-creating-more-than-one-contractor-post