Hey,

I recently updated my project to React 17 and noticed that in cases where I had EuiComboBox in EuiModal and EuiFlyout, clicking any options beyond the first "window" will cause it to scroll to top.

I'm relatively sure that this behavior is caused by EuiFocusTrap, here's a very quickly put together codesandbox that reproduces the problem. You can also downgrade the react-dom version down from 17 to 16 and see that it works fine.

I'm not sure how much the Eui team emphasize on keeping up to React updates. If it's not highly prioritized, I might try to help investigate if I get some free time.