Somehow I missed your response until now, game-ryo! I see what you did. That’s useful to understand those settings. After reviewing your comment and at least getting my sites to show up in the dropdown (without ajax), I went back to focusing on how to get the ajax set up properly. I returned to another implementation I’d had trouble with previously, from JamesImpression: https://github.com/JamesImpression/acf-multisite-select
The key was to register and enqueue the js (in assets/js/input.js) that calls acf.registerFieldType. It also allows for additional initialization code, but I didn’t need that.
I’ll try to keep an eye out for alerts if you see this, want to give it a try, and have any questions.
As for the “number box”, that is just what a multiple select field looks like when it is a single line. The arrows allow one to scroll through the options to select/deselect them.
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