How to get colored the background of the Top-Sites in Edge?

Hello together,

I use Microsoft Edge 44.18362.449.0 and mostly the background color of the Top-Sites is white like here:




Sometimes, it is really rare, they are colored like yesterday, but only for a short time:




Does anyone know, why it is like this?
I prefer the colored version and want to adjust it permanently! Is this possible?


Best regards,
allesgeheim

I just assume they changed it in an update as it was the coloured way even in Chromium Edge for a while.

It's really strange. Some times ago, when my brother also got these coloured backgrounds, I checked my Top-Sites, which were only white. Then I replaced my Top-Sites with his links. However, on my PC everything was still white.
My brother gave me a screenshot this time:



It looks like, that the background color is depending on the colors of the icons in the middle.