Dataset changes layout depending on value types

I’ve been looking to using datasets for the sometimes nice layout and scrolling possibilities.
However I’ve been trying to find a way to "force" the layout when using nested tables.
I can’t find any and it also seems to depend on the type of the values.
Are there any ways described to force a layout?

As a simple example.

planets = ExampleData[{"Dataset", "Planets"}]

ReplacePart[planets, {{"Earth", "Moons", "Moon", "Mass"} ->2, {"Earth", "Moons", "Moon", "Radius"} ->2}]