On Feb 19, 2019 a new message appeared in message center. It is “We’re changing your default SharePoint admin center experience “.
The SharePoint admin center experience, for Office 365 organizations of 50 or fewer licenses, will default to the new admin center experience. You can switch back to the classic experience as necessary.
We’ll be gradually rolling this out to Standard Release customers that have 50 or fewer licenses in late March, and we will expand to larger organizations in the coming months. We will provide further notifications when we make the change for additional organizations.
If you are administering PWA site collections, you must know how this will impact you. In the classic SharePoint admin center, you click New > Private Site Collection with Project Web App.
In the new SharePoint admin center, you click Active Sites > Other options. Select the template as Project Web App site, and type the site name, primary administrator details.
The new experience is elegant and easy to use.