Hi,
I don't see why that would be linked to PayPal.
It is important to display the tax for each product in the order so that you know the repartition of the tax amounts as different products can be taxed with a different percentage.
If you don't want that, then edit the file "show_products" of the view "order" for your backend template via the menu Display>Views and change the line:
<td class="hikashop_order_item_total_price_value"><?php echo $this->currencyHelper->format($product->order_product_total_price, $this->order->order_currency_id);?></td>
to:
<td class="hikashop_order_item_total_price_value"><?php echo $this->currencyHelper->format($product->order_product_price*$product->order_product_quantity, $this->order->order_currency_id);?></td>