This has also been requested for the Android app: https://feedback.seekingalpha.com/communities/1/topics/100695-euro-value

And a previous request for this has been marked "Completed" which makes no sense, as it does not seem to exist from what I understand: https://feedback.seekingalpha.com/communities/1/topics/30957-please-allow-euro-quotations-not-only-diollars

same here: https://feedback.seekingalpha.com/communities/1/topics/23292-pleased-let-us-switch-the-currency-of-our-portfolio-to-euro-thank-you

similar: https://feedback.seekingalpha.com/communities/1/topics/102043-please-expand-to-european-markets

Not sure I understand why incomplete requests are marked completed though.