How do I remove parts from collision groups?

I was creating a collision group, and I soon figured out that I had (somehow) added terrain to a collision group making a part fall through it. Now, I can’t figure out how to remove it. How do I remove parts from the collision group using collision group editor?

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That’s simple, you just need to add them to the default collision group which will automatically remove them from the existing group.

PhysicsService:SetPartCollisionGroup(Part, "Default")
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