Hello,
I think thumbnails are generating by max image width and max image height by default. If the uploaded image smaller than these values, thumbnail will not creating.
If you want to disable thumbnails creation, uncheck this settings. It will only disable thumbnail for the future uploads, no matter how big is the image.

I didn’t find any relevant information about that how to disable thumbnails from older uploads but if enough to you to hide these with simple CSS. This workaround might work. ![]()
Common / CSS
.cooked {
.lightbox-wrapper {
a.lightbox {
pointer-events: none; // Disable all click events on image
&:hover {
box-shadow: none;
}
.meta {
display: none;
}
}
}
}
