How can I change the brightness with a slider?

I can’t find the infinite extent thing, and I believe that is because we are working on different versions of the editor, since I’ve found the “unbound” option, which I think does the same thing?

297471-unbound.png

And the same thing goes for the “Get Actor Of Class”, because it doesn’t appear, even if I uncheck the “context sensitive” box

I’m working on 4.17, which version are you on?