Our Lord Jesus Christ himself, in scripture, speaks of the Flood as a living, breathing, true event. I’m going to take Him at his word. I do believe personally at that time that the “world” was still one mass i.e. pangea.
Genesis 10, after the Flood, speaks of the days of Peleg “when the world was divided”.
The problem is young earth creationists believe the actual numbers in OT writings so they believe Noah was only 350 years before Abram. No, Genesis 1-11 events cannot be specifically timed, but that doesn’t mean they did not happen.
I read a book years ago written by a Protestant theologian and the best quote I’ve ever read went like this, “The Bible is not meant to be a science book and science is not supposed to prove God.” Peace.