In the ArcGIS Online Web App builder, I have added the Attribute Table widget. For some reason - maybe I have removed or changed a feature source - I am not able to alter the widget. The feature sources of the widget seem to continue initializing without result for several minutes, and it is not possible to press any buttons in the display meanwhile, see attachment.
Can I somehow go behind the widget in a code or similar and alter it?
My only visible option is to mark the widget as not displayed - but then I can't use the widget at all.

Karl