Should I use just one sprite Atlas or more?

Hi, I’m new to the world of sprite Atlases, and I want to know which option is better for my game.
Since I have 7 different scenes with their own assets I have 7 atlases grouped by scene, but maybe it would be better to have all of them put together in just one big sprite atlas since is gonna be taken as just one image and one .json file.

I use atlases with 2048x2048 size max for a good compatibility with old(or low end) graphics cards.
And try to keep the number of atlases low.

Thank you!