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I've tried using Edge Enhancement, but it seems like when i do, if i minimize it, then come back to it, the brightness changes for some reason.
That appears to be a different issue than finding the Auto Enhancement.
Not sure what you really mean, it's hard to guess not knowing your exact setup, but possibly try changing display to RGB if you are using YUV as that can create such issue in PD depending on GPU configuration. Pref > Display YUV or RGB.
Jeff