Hi Roshan,
Xamarin.Forms can be a little difficult when it comes to layout positioning, It may take some experimentation to get the exact results you want.
Start here and then set Row Height to get the proportion you'd like.
One note: avoid putting a control that uses UI virtualization in a StackLayout (or Auto height RowDefinition) because they measure infinity. If you need to, make sure you set an explicit HeightRequest to the control.
Regards,
Lance | Tech Support Engineer, Sr.
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