Answers for "ElevatedButton set width of the button flutter to width of the screen"

elevated button size flutter

ElevatedButton(
    style: ElevatedButton.styleFrom(
    minimumSize: const Size(200, 50),
    maximumSize: const Size(200, 50),
    ),
onPressed: () {},
child: Text('ElevatedButton')),

raisedbutton full width flutter

FractionallySizedBox(
   widthFactor: 1, // means 100%, you can change this to 0.8 (80%)
     child: RaisedButton.icon(
     onPressed: () {
     	print(comment);
     },
     label: Text('Edit Comment', style: TextStyle(color: Colors.white)),
     icon: Icon(Icons.check, color: Colors.white),
     ),
 ),