Select All at All Levels doesn't seem to be working, lots of items are still not selected on the list on the left. Other options ?

<t>I'm trying to make a whole floor dim with very diffused light to remove unpleasant shadows.<br/>
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I do that by adding a huge light on top of the house and it works fine, the problem is that it makes the floor very far in the 3D view with no way to get closer. I would like the light to be ...