canadien / Canadien

Question

I think you have made an error in this example. Je connais un Canadien qui vit de l'autre côté de la rue.I know a Canadian who lives across the street.
You say all along that nationalities as an adjective are spelt all lowercase and not capitalized like in english. However here it is capitalized and even underlined!

...or am i missing something?

Accepted Answer

Kayleigh - in “un Canadien”, Canadien is a noun, not an adjective. In ‘un homme canadien’ it is an adjective.
See note on use of capitals in the link : 
 https://progress.lawlessfrench.com/revision/grammar/how-to-express-your-nationality-changes-whether-youre-a-man-or-a-woman-adjectives

Answer

This is Canadian as a noun, it’s a person