How do you change commentary?

Depends on where you're playing. If you're doing a quick game then you have a selection at the beginning where you can pick between random or one of the commentary teams.

Unfortunately... this doesn't apply to all game modes. For example, it seems we're stuck with Kate Scott in Ultimate Team, which I think is a major step backwards from the coach. Her commentary is plain out annoying: horribly bland, it sounds like she's merely reciting lines and that's it.

I really wish we could get the coach back ☹️