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Go to O365 admin center. From the left pane, under ‘Admin Centers’ section choose SharePoint. This method will change the default experience for all lists and libraries. Now if you want to return back to modern view from classic experience, you tried clicking on link that exit classic view, but the view doesn’t change.
Home page When you create a classic team site from the team site template, web parts for Announcements, Calendar, and Links are automatically added to the home page, while on a modern site, you get a section for News, Quick links, Site activity, and a Document library.
How to make your Root Site a modern site?
If you want to continue using the classic team site, enable the modern site pages library experience and set a modern page as the home page of the root site. This gives users a modern team site experience with the left navigation.
The following script will add the feature to the Site Collection, and enable it to set the ‘Classic SharePoint’ experience for lists and libraries:
Can you connect a classic site to a modern site?
There is not a 1:1 mapping between all features on a classic site and a modern team site. But site collection administrators can connect a classic site to a group, and update the home page to the new home page experience at the same time. Learn how in Connect a classic experience SharePoint team site to a new Microsoft 365 Group.
Where do I change the look of my SharePoint site?
Change the look settings are located under Settings in the top right corner of your SharePoint site. For team sites, you can change the theme and header. On communication sites, you can also change the layout of your navigation and add a footer to your site. Use a theme to change the colors of your SharePoint site