switchToInputEntryModeIcon property
An optional switchToInputEntryModeIcon argument can be used to
display a custom Icon in the corner of the dialog
when DatePickerEntryMode is DatePickerEntryMode.calendar. Clicking on
icon changes the DatePickerEntryMode to DatePickerEntryMode.input.
If null, Icon(useMaterial3 ? Icons.edit_outlined : Icons.edit) is used.
Implementation
final Icon? switchToInputEntryModeIcon;