Source can be downloaded from the EU website: https://europa.eu/eurobarometer/api/deliverable/download/file?deliverableId=97983
It’s linked to on this page (near the bottom in the “infographics” section): https://europa.eu/eurobarometer/surveys/detail/3492
Or view it as an imperialist institution and think their countries are better off with fiscal autonomy over a shared currency. Really, most anti-eu leftists argue mostly against using the euro than anything else from what I read