Cross-Platform missing when adding a new item

I have installed Visual Studio 2017 to follow along with online training for Xamarin created in May. I have created a Xamarin Cross Platform app, Blank App with Xamarin.Forms and PCL. They then instructed us to right click on the PCL, select Add new item and then select Cross-Platform. I did not have Cross-Platform as an option. I found a post for an older version of Visual Studio where they showed how to add it manually. I did this and it created the Cross-Platform item but this only contained four options instead of the ten in the video. Has this been taken away in a newer release or do I need to do something to add all the items? Many thanks