How to wrap the text and increase the height of the StackedHeader row based on that?

Wrap the text in StackedHeader Row:

You can wrap the text in StackedHeader cell by writing the style for GridStackedHeaderCellControl and setting TextWrapping as Wrap to the TextBlock.

XAML

Height based on StackedHeader cell content

You can set the height for StackedHeader row by handling QueryRowHeight event. In the below code StackedHeader row height is set based on content by calling GridColumnsizer.GetAutoRowHeight method.

C#

Sample:

WPF

WinRT

UWP