How Can I Change Height in ViewCell

The correct now in 2019 is put this for fix height:

<ListView RowHeight="100" />

If yout don't want fix height in all rows, use:

<ListView HasUnevenRows="true" />

• If all cells have the same size set ListView.RowHeight property on ListView itself
• If you want to set ViewCell.Height instead then set ListView.HasUnevenRows to true (but it has some performance impact)

Setting the height for the ViewCell will work only if ListView.HasUnevenRows or TableView.HasUnevenRows property set to true.