couldn’t figure out how to remove it but you can hide it by adding this to your functions.php
/*
Remove Notification: Meet the New Theme Builder…
*/
function dw_admin_theme_style() {
if (current_user_can( 'manage_options' )) {
echo '<style>.notice.e-notice.e-notice--dismissible.e-notice--extended { display: none; }</style>';
}}
