Always a good idea to have the free flight camera pointing slightly downward when editing the interior of buildings, this should avoid the entities zooming off into the distance. A distance cap is however a good idea
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PC SPECS: Windows 8.1 Pro 64-bit, Intel Core i7-5930K (PASSMARK:13645), NVIDIA Geforce GTX 980 GPU (PASSMARK:9762) , 32GB RAM