When I simulating it, I can't see the active lighting line?

When I simulating it, why I can’t see the active lighting line?

active1.jpg

Thanks for someone help.

On the toolbar (near Pause, stop buttons etc) in your BP Editor there is a dropdownlist with all the instances of the Blueprint. Select the one from the there and you will see the pulsing lines.

Thanks for your reply!

is it ? But nothing happened

c3bb00e2c41c2ad19d10289775e77bb77c894c61.jpeg

There is an another problem,
I made BP link sets like this: Unreal Engine 4 - RTS Style Camera https://www.youtube.com/watch?v=JmYke7RltlE

active3.jpg

but " mouse lock in Y " is ok,the other " mouse lock in X " is not work.

OK, the “RTS Style Camera” problem is solved. I shout create a custom game type to assign it.

But the pulsing line is nothing?