Secondary price is not showed..

Hello,
You will need to set price in both 2 currencies. And use the bar to switch between it. https://imgur.com/a/EFqIz9I

Ok, thanks a lot for que quick answer

Do we have to include the first currency? I only want the product to be available in the second currency.

Hello ckourounis,
That is possible but only on premium version. You can hide some currency from widget/currency bar. It is only available in back end.