Each input field in the search interface is preceded by an help button that opens a longer tooltip with a description and instructions on how to use the field. The button can be focused an the popup can be opened with Space and closed with Escape. For a screenreader this workflow is not very transparent. The button can be focused, but there's nothing read out. Opening the popup at least reads out the content immediately.
- Add a title/aria-description to the help icons that explains it's function
- If applicable apply aria-haspopup to make transparent, that triggering the button opens a popup
Note, that it might make sense to make these changes in the upstream library.