ReorderableList

Provides array type fields with an interface for easy reordering of elements. As of Unity 2020.2.x all lists are reorderable by default, so you no longer have to use this attribute.

Warning

Doesn’t work on lists that are nested inside serialized structs of classes.

public class NaughtyComponent : MonoBehaviour
{
    [ReorderableList]
    public int[] intArray;

    [ReorderableList]
    public List<float> floatArray;
}