To limit the search in WordPress to only post titles, you can modify the main search query using the `posts_search` filter. Here's an example of how you can achieve this: 1. Open the theme's functions.php file in your WordPress theme directory. 2. Add the following code to the file:  

function limit_search_to_post_titles($search, $wp_query) {
    if (is_search() && !is_admin()) {
        $search_terms = $wp_query->query_vars['s'];
        
        if (!empty($search_terms)) {
            global $wpdb;
            
            // Modify the search query to search only in post titles
            $search = $wpdb->prepare(" AND {$wpdb->posts}.post_title LIKE %s", '%' . $wpdb->esc_like($search_terms) . '%');
        }
    }
    
    return $search;
}
add_filter('posts_search', 'limit_search_to_post_titles', 10, 2);

  3. Save the changes and upload the modified functions.php file back to your server. This code adds a filter to the `posts_search` hook, which allows you to modify the SQL query's search condition. It modifies the search query to include a condition that searches for the given search terms only in the post titles. After making these changes, when performing a search in WordPress, the search results will be limited to only include posts whose titles match the search terms, excluding other content such as pages or post content.