Enable or disable preview features in SharePoint
The Preview Features setting in the SharePoint admin center lets you enable or disable integration with other services. The setting is enabled by default.
The Preview Features setting isn't related to the Targeted release option, which allows you to receive new updates and features as they become available. If you're interested in signing up for that, see Set up the Standard or Targeted release options in Office 365.
What the Preview Features setting enables
Use the Preview Features setting to enable the following features, and others that are added in the future.
Power BI integration with Excel Online
When you use Power BI, your data is sent to the Power BI service. If you have implemented compliance policies for your SharePoint environment, these policies won't extend to the data as it's processed in Power BI. If this is a concern, select Disable preview features for this setting.
When you disable preview features, your users will no longer be able to use Excel Online to view and edit workbooks that rely on Power BI.
To enable or disable preview features for your organization
Sign in to https://admin.microsoft.com as a global or SharePoint admin. (If you see a message that you don't have permission to access the page, you don't have Office 365 administrator permissions in your organization.)
In the left pane, select Admin centers > SharePoint. If this opens the new SharePoint admin center, select Classic SharePoint admin center in the left pane.
Select settings in the left pane.
Next to Preview Features, select Enable preview features or Disable preview features.