Right click in the background and type ‘make postprocess…’ and you’ll find MakePostProcessSettings. When you have that node, look at the details panel, it has everything you need, you can just enable the bits you want.
And then do this:
Sorry, my English is not very good. I just started to contact UE4, checked a lot of information, found that I want to use the blueprint to control the parameters below, but there seems to be no corresponding tutorial, can teach me the detailed operation process, thank you very much。
Thank you very much for your answer. This question has plagued me for several days. But it seems that I am done, the view is still not displayed, is there a problem?
Feel free to accept my answer 
It’s suddenly good, thank you very much.
Thanks 
but on the answer, you can select ‘accept this answer’… 
Greetings!