How to delete show all products?

Hi,

1. You would have to remove the line:
$limits[] = JHTML::_('select.option', '0', JText::_('HIKA_ALL'));
in the file administrator/components/com_hikashop/helpers/pagination.php

2. Please provide a link to that page so that we can look at the CSS of the page.

You can add such CSS in the frontend CSS file of HikaShop:
.hikashop_category_list_item, .hikashop_product_list_item {
display: block;
width: 100%;
}