This is a roadblocking issue for us using query builder. We use several on the same page and when you open the selects, they appear in the wrong place. If you open the third, the dropdown doesn’t show at all. Each of the query builders have their own unique ids and containers. We happen to be using it w/React but I don’t believe that is causing the issue.
Screenshots are available here: Webix Query Builder Dropdown Location Issue - Album on Imgur