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You still have to only choose one of the three to vote for.
I think it's slightly less stressful though, as there's much less onus put on you trying to decide which of those three will be the one that emerges as the main challenger - especially if you're voting early by post.
I'll likely go Lib Dems for what it's worth. I joined them a couple of years back as a response to their being the only anti Brexit party that seemed to have a plausible presence where I live. Feel I should follow through on that.
My ballot paper says to only pick one box - I think the parties choose the order of the candidates that get put forward.
Method here:
https://en.m.wikipedia.org/wiki/D%27Hondt_method