Panel thumbnails cannot be deactivated

Hi Kirby,

I tried to remove the preview/thumbnail image in the panel (listing of all pages). I either want to chose the image that is shown or just show an icon.

I tried to do this:
But that gives no response. It still shows the thumbnail image.

Could you give me directions?

Regards, Edward

Have you cleared the browser cache after changing your blueprint setting?

Yes I have cleared the browser cache. No result.
Additional information: I am using the ‘pages’ preset in ‘site.yml’. Could that be the cause?

I don’t know, please post the complete blueprint.