Initial setup of PostProcessQuality in the Editor .ini files does not actual change the setting. The project must be opened once and then closed in order for the settings to take effect.
Result: The setting is now on Lowest
Expected: The setting would be at Lowest to begin with as that is what was set with the 0
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-67672 in the post.