It feels obvious to say this is a game to be cautious, not to leave any spaces for France to exploit in transition and not to let the backline (Shaw/Maguire especially) get isolated 1v1. Even if Walker (presumably with the assistance of Henderson and Saka) keeps Mbappe quiet then Giroud, Dembele or Griezmann can just as easily find a way. Griezmann in my eyes is just as important to France as Mbappe is, so I hope England stick with the 4-3-3 to keep the midfield numbers to try to nullify him in his deeper role. England will be as reliant on Rice and Henderson putting in big performances just as much as Kyle Walker.
I see two possible weak spots in what I presume will be France’s starting XI. Kounde, as mentioned by others on this thread, at right-back is one. If England on the counter use Bellingham’s ball progression and Kane’s passing range to find Foden on the left, there could be some joy there. We’ve also seen a few Lloris calamities down the years. His dropping the ball almost onto the head of Lewandowski reminded me of a few times he’s made a mess of balls into the box: against Man City earlier this year, Liverpool 2019, Chelsea 2018 etc. That could be a set piece exploit for England (though there is probably more to beating the world champions than simply sticking the big lads on the goalkeeper at set pieces ).