I accidentally hit "build Lighting" on my dynamic lighting only project and low it looks like some of my geometry has lightmaps on it. how do I remove those and force zero lightmap building?

Development Rendering
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314442-lightmap.jpg
314442-lightmap.jpg1902×549 55.8 KB

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I found this link: Can I delete lightmaps from map file? - Rendering - Unreal Engine Forums.
You can’t delete lightmaps manually you have you have to check this Force No Precomputed Lighting and rebuild.

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I tried that. Checked that box for force no precomputed lighting then restart the engine, then hit build/build lighting but the ugly artifacts int he screencaps are still there. I’ve tried many times.

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Have you tried restarting the engine after rebuilding?