When creating a new widget, the Group By filter is not working as expected. While scrolling through the options, the drop-down will randomly disappear. The search bar does not appear every time you click. When double-clicking, the search bar will sometimes appear but it might also disappear at random.
This Issue occurs when the user clicks multiple times on the Dropdown which another request is already running.
Perform a Single Click on the filter attributes and wait for the attributes to be displayed. The number of attributes could also be causing the list to show up late.