after the last update I tried to edit some existing pages with Elementor Pro, but was unable to do this. I contacted the Elementor support team and after several discussions and analysis of my WP environment they say that this is because of the fullscreen slider of my first page. What I found out was that I can create new pages and edit them after creation for modification. But my very first pages I am still using cannot be changes. It is also not possible to use the safe mode to modify any page. This phenomenon holds for all pages I created, except for the new once. I also switched off all plugins, but didn't found any negative impact. Therefore there is not plugin conflict.
webpage is https://fotografie.io
The Elementor guys said, if there are some additional questions about their analysis, you can contact them directly.
Thanks for any hint, Harald