Are the millennials in continental Europe left-wing like the ones in the US and UK?

[parochial boy]

Continental Europe is much to big and diverse and has far too many different political and economic contexts for it to be really possible to make a generalisation. So, you have a massive rejection of the establishment parties in say France (mainly to the advantage of various left wing outfits, and to a lesser extent the RN), Italy (profiting the M5S last time round) or Belgium (profiting both the far left and right). At the same time, you have the likes of Switzerland or Germany where younger people seem to have swung towards socially liberal and left wing, but not really populist/anti-establishment, Green parties; or Sweden where it seems like it has been to the benefit of a socially-liberal centre-right; with far right populists doing badly in all three of the above. Then you have the EU accession countries east of the iron curtain which have a totally different vibe in terms of age-driven voting patters. See for example the fondness that young Poles have for various sorts of radical right or nationalist outfits.

At the risk of a broad generalisation, young people in the "happier" countries tend to like Greens and other socially liberal parties while rejecting the far right, and in the "less happy" parties they are more inclined to vote for anti-establishment populists of assorted stripes.