I would also prefer to see the whole word/get rid of the two columns. BUT I think that’s unlikely to happen - they aren’t going to give up the two columns in general (in most cases it works well), and making a setting for it would be a certain amount of work.
Making an option for a smaller font however, should be a pretty simple thing to do, because there already exists an option for a larger font, which should make it easy to identify all places where it occurs. If such an option is introduced, you’ll still be perfectly able to not use it.
I am also not the only one taking my courses - in fact I raised this issue because a friend was complaining about it. A local user script is never a solution to anything, HOWEVER, the way memrise is currently functioning, it isn’t designed for languages with long words (even though German is a much larger language than Greenlandic), so realistically, I think users interested in such languages will de facto be stuck with a choice between malfunction or userscript.
Let’s not discard a realistic 90% solution just because we can’t have the perfect solution.