I have this code:

Column(
  children: [
    Row(
      children: [
        SizedBox(
          height: 20,
          width: 20,
        )
      ],
    )
  ],
)

I get a warning in the DevTools that the SizedBox is unconstrained. How is that even possible? It has specified dimensions. Obviously Flutter is not behaving in a way that feels logical in this situation. However, I would like to understand why this is, and how my SizedBox should be constrained properly? What is best practise here? Also let’s say I have multiple SizeBox in the same Row/Column, what would be the best praxis then?