Screen Percentage is available in Preview Scene Settings even though it has no effect

In Preview Scene Settings, the user is able to adjust the scene's Screen Percentage, even though it has no effect in the preview (it only works when playing in game).

1. Open QAGame in editor.
2. Open a skeletal mesh in Persona.
3. Focus the Preview Scene Settings.
4. Under Post Process Settings > Misc, enable Screen Percentage.
5. Set it to a lower value.

RESULT:

Nothing happens, because the effect only happens when playing.

Fix UE-51650

i have this problem UE4CC-Windows-58DC12AF4B97F057BD108FBFF569B2E9_0000

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