Switching from classic back to modern view
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. Even if you try to change in the document library settings (Advanced settings) and the SharePoint Online Admin Center nothing works.This is because of the classic view changes saved as the session cookie. So in order to move back to modern view immediately you need to clear the cookies stored in browser and below are the steps how to do it.
- Open developer tools(F12) in the browser. Just click F12 function key.
- Click on application tab,expand cookies section and select the sharepoint online site which you currently working on.
- Delete the one with the name ‘spinu’ that has the value 0
- Refresh the browser and that’s it!! you are now moved to modern view
Obtained from: https://infosharepoint.com/switch-back-to-modern-view-in-sharepoint-online/