cannot change widget

I am not able to add any object (text, Picture, …) in the widget.
I can drag into the sidebar a new object but when I press the save button I will get only the running circle (see enclosed Picture) and it will never be saved. (see attached Picture).
In the frontend I will not get the changes.
Hope somebody can help me.

I have check the plugin and notice that the Plugin “WP Fastest Cache Premium” will block the saving in the widget.
Does there exist a solution for this Problem.
kindly regards

Hello there,

I hope you are doing well today.

If the cahing plugin is causing an issue then you need to remove the plugin and try using another such as the following:

Best Regards,