I’m afraid this is not possible. You need to modify the core files to do that. You can check how it works in “wp-content/plugins/advanced-custom-fields-pro/pro/assets/js/acf-pro-input.js”, but you need to apply the modification in “wp-content/plugins/advanced-custom-fields-pro/pro/assets/js/acf-pro-input.min.js”.
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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