Keep new and old document library view
This is great but the option to use the older library by default should be available. The admin should be able to select the "one drive" view or the SharePoint view. It also should reflect the branding applied to the site in this version it seems that the user went to other site. The navigation from SharePoint should be always visible.
Classic view is going nowhere anytime soon. Library owners and administrators will be able to choose the classic or the new experience. More information: