I'm not seeing a page of my favourite sites when I open a new Safari browser

Up until a few days ago, whenever I opened an extra Safari browser, there used to be an array of icons representing all of my favourite sites. All I see now are references to Apple products, like this:

Previously, I got an array of icons that reflected my line up of favourite sites:

This is happening and I haven't even updated to Mojave yet.

How do I correct this situation, on the assumption that I can? I find it annoying because it's not down to anything I've done.