The default layout of the RadMap is represented by the UI controls that appear in it. If you want to remove one of them you can easily set the respective property of the RadMap:
Navigation control: The control visibility is control by the NavigationVisibility property.
Scale control: The control visibility is control by the ScaleVisibility property.
Command Bar: The control visibility is control by the CommandBarVisibility property.
Mouse Location Indicator: The mouse location indicator visibility is control by the MouseLocationIndicatorVisibility property.
ZoomBar control: The control visibility is control by the ZoomBarVisibility property.
In case you want to hide all of the controls and create your own custom layout, you don't have to set each of these properties, you can simply set the UseDefaultLayout property of the RadMap to False.
<dataVisualization:RadMap x:Name="radMap" UseDefaultLayout="False"/>
To learn how to use each of the RadMap controls independent and outside of it, read the following topics: