Light mode uses a lot more power than dark, and defeats the purpose of power saving. However, I thought it was just supposed to dim the screen brightness, rather than change the mode. Have you checked the power saver settings? Asking because I don't have the update yet, and I'm trying to prepare myself. I also try never to let my phone go into power saving mode, because I don't even like to have the screen dimmed.
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I finally figured it out & I'm going back to an iPhone. I have told Samsung for years to stop screwing up my phone with software updates & they refuse to listen. They have zero respect for people & I'm not putting up with it anymore.
