Cannot set Expander's expand direction as "Right"

[LHTXQ]

Describe the bug

Cannot set Expander's expand direction as "Right".

To Reproduce

Add an Expander to XAML and set FlowDirection="LeftToRight" ExpandDirection="Right".

Expected behavior

The Expander's expand direction changes from down to right after set ExpandDirection="Right".

Screenshots

Bug:

Expect:

OS version

11

.NET version

6.0

WPF-UI NuGet version

2.0.3

Additional context

No response

[micahmo]

+1 It appears that vertical expansion is really the only supported behavior, and changing ExpandDirection does nothing.

[J0rgeB]

+2 It appears that vertical expansion is really the only supported behavior, and changing ExpandDirection does nothing.