Depth of Field in 4.23

Please somebody tell me how to use DOF in 4.23. I want to use DOF with a regular camera actor, not with cinematic camera. The documentation said I can look for these parameters here:

https://forums.unrealengine.com/filedata/fetch?filedataid=178528&type=thumb&attachmentnodeid=

I enabled the Depth of field layer visualization. And it seems only the Focal distance and Depth blur radius do something. If I adjust anything else nothing happens. Someone can tell me why?