Hlod override transition screensize does not work

hlod override transition screensize does not work.

I created an HLOD for an entire building, and would like to change the screensize / distance it transitions at… but it wont let me… the checkbox is enabled… and any number values, could be .1 … could me .9… do nothing at all. could even be 1000…

*Update Min Draw distance on teh LOD actor seems to work but i dont know if thats the correct method.