Hello Dev Team,
Please try if setting the UseClassicDialogs
property to true
will solve your problem. In order to do so you need to modify the respective ConfigFile.xml or ListConfigFile.xml (for forms such as wiki, list, blog ...), which are located in the /Program Files/Common Files/Microsoft Shared/web server extensions/wpresources/RadEditorSharePoint/188.8.131.52__1f131a624888eeed/RadControls/Editor/CssEditor.css folder.
I hope this helps.
the Telerik team