Ambient occulsion and set sampling

I’m using 2.8 and I expected to find ambient occlusion and to set sampling in the world tab. Its not there. Where can I find this?

Are you using cycles or Eevee?

eevee but I can change

AO has been moved to the render settings:

The number of AO samples is unified with the number of viewport/render samples.

a tutorial said to set sampling to 10 for AO. Do u agree?

10 would be fine, doesn’t matter that much. if it’s too noisy, turn it up, if it’s taking too long, turn it down.