From Microsoft Corporation:
“We are introducing custom search results pages for SharePoint sites.
•We’ll be gradually rolling this out to Targeted Release customers in early January 2020.
•The rollout will be complete by the end of February 2020.
This message is associated with Microsoft 365 Roadmap ID 32738.
How does this affect me?
This feature will allow tenant admins or SharePoint site owners who have specialized search needs to build a custom results page. Build it using open-source search web parts from the SharePoint Patterns and Practices community or any custom web parts developed using the SharePoint Framework. Only the modern navigation bar search box can display a custom search results page.
What do I need to do to prepare for this change?
All modern SharePoint site owners will be able customize a search results page
Before enabling a custom search results page, either an admin or SharePoint site owner must first build the custom page.
Either an admin or SharePoint site owner can enable its use. To do so, go to Site Settings -> Site Collection Administration -> Search Settings. Then input the new page URL in the Results Page URL field.
The custom search page and the SharePoint site must be on the same domain but the search page does not need to be in the same collection.
There is no action you need to take to prepare for this change, but you might consider updating your user training and notifying your help desk.
For details on the feature and examples of how the feature might be deployed, please see this video recording of the Ignite 2019 Search Customization and Development session.
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