Orientation
Orientation has two possible options (Horizontal/Vertical) and specifies whether the items are listed vertically (the default option) or horizontally.
In RadioGroup, it affects the location of RadioButtons - vertical and horizontal:
For the StackPanel container, the orientation property controls the placement of its child elements stacked one under another (Vertical orientation) or stacked in a row one beside another (Horizontal orientation):
For a Slider widget, the orientation property places the scale vertically (Vertical alignment) or horizontally (Horizontal alignment):
Associated containers, widgets and theme elements: