This members-only tutorial provides the steps to set up an advanced search form that allows the visitors to search for entries in one or more Custom Post Types in Oxygen based on this WPBeginner article.
We shall add Posts, Projects
When none of these are ticked,
When one or more post types is/are checked, the resulting search will show entries from the selected post types.
Install and activate Code Snippets plugin.
Go to Snippets > Add New.
Title: Add hidden inputs to search form for advanced CPT search
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