The Light Mixer window is new in UE 5.1. It makes it easier for any lighter to access all of the lights in the scene, modify the parameters. It even gives the ability to solo lights.
Do you know that you can also create your own ‘Mixer’ window?
https://dev.epicgames.com/community/learning/tutorials/Gya6/unreal-engine-an-introduction-to-the-object-mixer-filter-system-used-by-the-light-mixer-window
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