How to set the width and height of a button in Flutter?

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I have seen that I can’t set the width of a ElevatedButton in Flutter. If I have well understood, I should put the ElevatedButton into a SizedBox. I will then be able to set the width or height of the box. Is it correct? Is there another way to do it?

This is a bit tedious to create a SizedBox around every buttons so I’m wondering why they have chosen to do it this way. I’m pretty sure that they have a good reason to do so but I don’t see it.
The scaffolding is pretty difficult to read and to build for a beginner.

new SizedBox(
  width: 200.0,
  height: 100.0,
  child: ElevatedButton(
    child: Text('Blabla blablablablablablabla bla bla bla'),
    onPressed: _onButtonPressed,
  ),
),

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