I just migrated my site collection from SharePoint 2007 on-premise server to office 365 using ShareGate.
Site move was successful and now all my content is in the cloud. The problem is that my site still looks the same only and UI.
- When I click on a Doc Library the new UI is shown (which is great)
- If I create a new Team Site the new Modern UI is shown
How do I update all my migrated sites to the new Modern look with all the great looking Web Parts and such.