product background and thumb size

Greetings,

I was able to change the background color and thumbnail size on the Categories by going to ->Display ->Content Menus and editing the configuration.

This only changed the Categories and not the Products. How can I change this for the Products, as shown in the provided image. I need my products to not have a white background and for the thumbnail to be larger.

Thanks!

I am so close, this information helped very much, but I can't change the thumb on the last page. I want to increase the thumb size on the image shown. Part 2, I checked all the settings in the areas shown, and none of these options change the size of that thumb image. How can I increase the thumb size?

Thank you! Thank you! Thank you!