How do I fix lighting glitch between scenes?

Returning to Unity after a year of interruptions! I asked this question before, and the answer had something to do with the lighting settings, but I can't remember or figure it out, and I don't want to cause more damage.

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All scenes look fine in the Scene View, and once I move to Game View nothing changes, but once I trigger a scene change, everything goes much darker. Still visible, just very shadowed. Also, I notice my hierarchy collapses, but if I remember right that had nothing to do with it when I had this problem before...

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Thanks for the help, friends!