Disable unnecessary thumbnails

I upload 1 image to my page, and 14 other images get created.

I’m a photographer and I do need only maybe 3 other thumbnails beside my full size image.

How can I disable creation of all those additional thumbnails?

I don’t need full width images, i run grid blog, and no portfolios…

I found a few in functions.php, but there are others somewhere else..

I tried disabling those thumbs with this in my child theme functions.php: but .. failed :)

$avia_config = array(‘width’=>0, ‘height’=>0); // small preview pic for slideshow thumbs

Please, let me know how i can disable creating those thumbails. I am using a child theme, so ideally, I’d like to disable them in my child theme functions.php, instead of deleting code from theme core files.