add_action( 'woocommerce_email', function ( $mailer ) { remove_action( 'woocommerce_email_footer', [ $mailer->emails['WC_Email_New_Order'], 'mobile_messaging' ], 9 ); } )
Remove “Get the app” mobile messaging from WooCommerce Admin emails
Another annoyance from the WooCommerce Marketing Department has added this footer line to the emails.
Process your orders on the go. Get the app.
Add this to your functions.php file