How do you create a new root object to organize a large scene?

I thought I could use an Empty, but apparently not:

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Change the mobility of that empty actor to static ! :slight_smile:

Well, here is what I see when I click on the mesh I want to put under the empty:

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And here is what I see when I click on the empty:

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So how do I make the empty static?

the target actor (root) is dynamic and won’t let you move a static actor underneath.

set the static mesh a movable before drag and drop

But what if I want it to be static for light baking purposes (not my case, but still, would be interesting to know)?