Where can you activate GI?

I am having trouble to see the GI when using the Sun & Sky System.
my GI is not strong enough. Even when bumping about the GI Bounces to 100 - testing Brute Force and Final Gathering.
Nothing. The Shades stay pitch-black.

Is there a tutorial that shows step by step what you have to activate to actually have the GI activated?

My Project Settings have Ray Tracing on.
I am using DX12 - supported stdio drivers by Nvidia and RTX 2080
PostProcessVolume: Ray Tracing activated + increased bounces

When I boost the INDIRECT LIGHTING INTENSITY inside of the Global Illumination Rendering Features> I don’t see any boost in the GI.
Nothing happens, no effect at all.

I don’t understand what it means:
The show Flag Global Illumination must be enabled.

  • Where to enable?
  • How to enable this feature?
  • I can’t find any flag for GI???

I simple enabled GI in the PostProcess Volume.

Thanks a lot for any help!
appreciate it!