Hi,
You can't do that.
However, what you can do is to edit your menu item via the joomla menu manager, and under the "product options" tab, set the "popup mode" to "popup only". That way, you'll get a popup on the listing to select the characteristic(s) and add to cart.
Another solution would be to use a custom item field (
www.hikashop.com/support/documentation/4...shop-field-form.html
) together with the price calculations plugin (
www.hikashop.com/marketplace/product/148...ce-calculations.html
) instead of a characteristic with variants. In the settings of your menu item you can activate the "custom item fields" display setting and you'll be able to achieve the same look as your screenshot.