All these form builders are not usable for me because it is only designed for simple cases in mind. One exmaple is that have a simple select list. In real world cases, most master data is select is pretty long so you need to search and filter, so there must be an autosuggest search box for select. It needs to enable single /mulitple select as well.
You are absolutely right! Its definitely one of the most requested features and will be shipped soon. Can you give an example so we can make sure it fits your needs?
https://mui.com/material-ui/react-autocomplete/#multiple-val...
We typically hook it up to Formik or react-hooks and compose complex forms out of it, but would love to see a form builder with similar power.