ENHANCEMENT: How can i change thenBottom bar height when its closed?

Hi everyone, i have bottom bar in my flutter app and i want to make tha bar height bigger when its closed. I didn’t find a way to do this yet. I’m currently using RubberBottomSheet. See my code below.

return Scaffold(
body: Container(
child: RubberBottomSheet(
scrollController: _scrollController,
lowerLayer: _getLowerLayer(
storeMap, context, locSnapshot.data),
header: Container(
color: Colors.transparent,
child: Container(
decoration: BoxDecoration(
color: Theme.of(context).primaryColor,
borderRadius: BorderRadius.only(
topLeft: const Radius.circular(35.0),
topRight: const Radius.circular(35.0)),
),
child: Icon(
MdiIcons.dragHorizontal,
color: Colors.white,
),
alignment: Alignment.center,
),
),
upperLayer: _getUpperLayer(storeMap, storeNames),
animationController: rubberController,
),
),
);

Please help thanks in advance!