Why is my screen completely green?

So yesterday I used the “Use Custom Depth as Mask” under High resolution Screen Shot. Now today I re-open Unreal and the screen is completely green, the same as if the Custom Depth as Mask was activated. The only way I can see my scene is by opening the High resolution Screen Shot tab. Why is this happening and how do I fix this?

Is it possible that that view mode is set to one of the buffer visualizations instead of standard Lit?

You may have activated some options for Chroma key take a look, this may help you:

Custom Chroma Key inside UE4 - Content Creation - Unreal Engine Forums

So I discovered the Issue. It is simply a glitch with the “Use Custom Depth” as Mask option. If you quit while that is being used it will do the glitch as stated above. Its fixed by clicking and un-clicking the check mark and quitting unreal when the menu is still up.

I can confirm that this is the solution. Thanks for posting the solution!

where i found this options?
please detailed explaination