Disable post update in front end submission form

Hello,

You can use the PHP code to check if the query var rwmb_frontend_field_post_id is available and output a custom CSS code to hide the submit button. For example:

add_action( 'rwmb_frontend_before_submit_button', function() {
    if( isset( $_GET['rwmb_frontend_field_post_id'] ) ) {
        ?>
        <style type="text/css">
            .mbfs-form .rwmb-form-submit {
                display: none;
            }
        </style>
        <?php
    }
});