Contact Form 7: Disable Automatic Paragraph Tags in Form Markup

<?php
if ( defined( 'WPCF7_VERSION' ) ) {
    /**
     * By default CF7 wraps form content with wptexturize() and wpautop(),
     * which can insert <br> and <p> tags that break custom form layouts.
     * Returning false from this filter disables that behaviour globally.
     */
    add_filter( 'wpcf7_autop_or_not', '__return_false' );
}