How to make under category Open cart CMS 2.0 images?

Question

opencart

You want to make a subcategory of the main category an image. The engine is set to display the main categories as an image, but the subcategories are displayed as a regular list. I dug up the file code but could not do anything. Help please experienced people!

and a second question:
There is a main category Men and women in them have subcategories of sneaker brands should be divided into two categories and placed at the bottom of the subcategory. I tried to edit the category module but it didn't work. In the default version of the category, a spoiler type was made. An example is my site and I need this
, can someone throw off the documentation for the code ( <?php if (!$categories && !$products) { ?>) of this type to display a subcategory or image, etc.
Thank you in advance