Only affects the editor ortho viewports in Lit modes.
Set the scale to proportionally alter the near plane based on current Ortho width that is set.
This changes when geometry clips in the scene as the Orthozoom is changed. Helpful for varying mesh sizes.
Other light artefacts may appear when this value changes, this is unavoidable for now.
Usage
r.Ortho.EditorDebugClipPlaneScale [value]
Set via the console (~) or in DefaultEngine.ini / DefaultGame.ini.