Hi,
There is no setting for that.
The retail price is displayed "as is".
Add the code:
$round = $this->currencyHelper->getRounding($currCurrency,true);
$this->row->product_msrp = $this->currencyHelper->getTaxedPrice($this->row->product_msrp, hikashop_getZone(), $this->row->product_tax_id, $round, false);
before the line:
$msrpCurrencied = $this->currencyHelper->convertUniquePrice($this->row->product_msrp, $mainCurr, $currCurrency);
in the file product / listing_price via the menu Display>Views and it will add taxes on top of the retail price being displayed.