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The Step Sizes dialog controls how far the view moves when the 3D Navigate right click menu is used (shown below).


These step values only apply to the 3D Navigate controls, which are only enabled when 3D view is selected.
When you click the menu command:-
- Rotate Left / Right, it will rotate the view by the angle specified in the Rotation (Horizontal) box.
- Rotate Up / Down, it will rotate by angle specified in Rotation (Vertical).
The distance moved by the other non-rotation controls is set to the value of Pan.
The default values for these are 5 degrees and 200mm, as shown.