Disable the Content-Security-Policy header
RECOMENDATION: We do not recommend disabling the Content-Security-Header. This can make your site vulnerable to various attacks, such as Cross-Site Scripting (XSS). We recommend configuring the header instead.
For more information, see Configure Content-Security-Policy header.
To disable sending the header, perform the following: 
    - Open the Program.csfile of Sitefinity ASP.NET Core Renderer.
- Modify the services section in the following way:
    
    
- Save and close the Program.csfile.
- Build and deploy the renderer application.