Microsoft has released guidance on how tenant and site administrators can enable and disable the new SharePoint document library experience for users. See this article:
Using this method, I was successfully able to alter the user’s experience, but here is a caveat… When you alter the setting in the SharePoint Admin Center:
the effect is not immediately apparent. There is a delay between when you make the change (to either choice) before a user will notice. SharePoint Online must be going through programmatically and changing settings at a library level. For my test, I only have one site with one document library in it in the entire tenant, and it took between 30 and 60 minutes to update.
Also I noticed that Microsoft is calling this setting SharePoint Lists and Libraries Experience, even though the settings provided are only exposed for libraries, not lists. Is more change to come to our list views?
Related Posts
- New SharePoint Document Library Experience (04/19/2016)
Content Precedes Design 
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