Hueman Thumbnail creation nescessary?

I’m currently overlooking all of the media om my website and noticed that both WordPress as well as the Hueman template have a function to create multiple thumbnails of each image that is uploaded.

The WordPress media thumbnail creation can be disabled by entering zero’s as value.

How can the Hueman thumbnail creation be disabled or reduced?

If found a plug-in which helps to clean up all of the thumbs, but some thumbs are nescessary so certain featured images are being displayed correctly.

By default Hueman creates six thumbs, which is a bit much in my opinion. What is the proper way to gain more control of this feature? I’d like to be able to disable thumbnails that are not used.

The page I need help with: [log in to see the link]