Thumbs db are shown in my folders, why?

When I open my Cloud Home folders with my pictures on Windows 10 (via WD Discovery) I can see the thumbnails icon (db).

Why is that??

For example: if I have 10 pictures in a map, it’ says I have 11 files. That is because the 11th file is the tumbnails file (which I also can see). Why does this icon show up like this? I have never seen it before (regardless if it’s a separate HDD och cloud space like OneDrive) where I have saved my pictures.

Anyone that has an idea about this why this is happening and how I can fix this?

Thanks!

Thumbs.db is a thumbnail image cache file database to make viewing thumbnails images faster.

You may want to look at this too. Thumbnail Definition

Ok, thank you. But why is it shown? Should it not be invisible?