Add Web Security - Trusted Sources

NOTE: For versions of Sitefinity without the Web Security Module, please follow the instructions provided here for configuring predefined security policies and HTTP response headers.

In the Sitefinity Dashboard, navigate to Administration > Settings > Web Security, then click Edit next to "Content-Security-Policy" on the right-hand side of the page.
Under Scripts, add the following URLs:
https://code.jquery.com

https://kendo.cdn.telerik.com
Expand the Fonts, images, video and audio section.
Under Images, add the following URLs:

*.tile.openstreetmap.org

https://kendo.cdn.telerik.com
Expand the Forms, frames, child sources, connect sources, plugins section.
Under Frames, add the following (assuming you have Power BI integrated):

blob

https://app.powerbi.com

'self'
https://www.google.com/

Under Child sources, add the following:

blob

https://app.powerbi.com

'self'
https://www.google.com/

Under Connect sources, add the following URLs:

https://kendo.cdn.telerik.com
https://netdna.bootstrapcdn.com
Click on the Done button. The settings have been updated.