Hi Bala,
Thank you for contacting us! You can find information regarding listview orientation setup in this article - http://docs.telerik.com/devtools/xamarin/controls/listview/features/listview-features-layouts
Regarding the described issue - would it be possible to share some additional information regarding the contents of the cells of the list view. This will helps us to investigate it from our side and locate any potential issue.
Regards,
Tsvyatko
Telerik
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