Hi CHANG CHIEW THOU,
Greetings from Syncfusion.
Currently we don;t have support for navigating to the SegmentedItem based on the SelectedIndex to the visible area and we have to scroll manually. We have considered this as a feature and logged a feature report. This feature will be implemented in any of our upcoming Volume releases.
Please visit our website periodically to get the latest updates.
Regards,
Paul Anderson