Hi,
You need to go in the menu Display->Content menus and edit your menu item.
There, you will find all the options of the categories listing.
Then, if you click on the link to the associated products listing module on that page, you will be able to change the display options of your products listing.
There, I would recommend to either reduce the number of columns, or change the item box layout to "title and image" in order to not have the elements "going out" of their boxes on the products listing.
Then, if you want to not have all the description of each product on the listing, you need to edit your products and add a "read more" tag where you want your text to be cut out on the listing. You will find a "read more" button at the bottom of the product description area for that if you have the "read more" option of the configuration of HikaShop turned on.