The Connector for SharePoint
has been introduced in Sitefinity 6.0 but currently we do not provide functionality for connection to SharePoint Online. Hopefully we'll be able to provide it in our upcoming releases.
You can refer to the following article
from our documentation for additional information about synchronizing Sitefinity with a SharePoint site.
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items