Change Bacs Default Payment Status to processing

With the following snippet all Orders with Bacs Payment will automatically get the status “Processing”

Copy the following snippet inside your functions.php on your child theme

add_filter( 'woocommerce_bacs_process_payment_order_status', function( $status = 'on_hold', $order = null ) {
    return 'processing';
}, 10, 2 );