Yes, you only need to add the tracking ID and leave the other input box empty. I checked the code of your site and the code is properly applied.
<script async src="https://www.googletagmanager.com/gtag/js?id=UA-142174884-1"></script>
window.dataLayer = window.dataLayer || ;
gtag('js', new Date());
And about the grid, it's a different issue. I recommend re-editing your page and add them again. The shortcode is converted to this
[ess_grid alias=”stills” which is why it's not working. I'm not sure what happened but the only solution is correcting the shortcode or re-add it to your page.