If you haven’t added the posts_where filter that is definitely why you’re not seeing any results.
Please have a look at the link I’ve posted twice now. In there Elliot explains how to use the posts_where filter with example 🙂
It does get added to your functions.php yes. The reason you need this filter is to modify WordPress core behaviour for meta_queries to do a LIKE search letting you find crew_0_blabla, crew_1_blabla etc.
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ACF PRO’s Flexible Content field allows you to create smaller pieces of UI and compose them into whole flexible patterns. In our latest article, we show how to use it to create swappable site sections and integrate it all in a theme.https://t.co/ZRocH8oJSp