drawerIndicatorWidth property
Defines the width of NavigationDrawer's indicator.
If drawerWidth is defined and drawerIndicatorWidth is not, then drawerIndicatorWidth will be drawerWidth - 2 * 12, where 12dp is the M3 padding spec around the indicator.
If not defined, and drawerWidth is not defined it defaults to 336dp via Flutter SDK defaults for M3/M2. The 336dp width values is derived from the M3 padding spec of 12dp around both sides of the indicator.
Implementation
final double? drawerIndicatorWidth;