How to change the background color of level editor viewports?

There is any possible way to do it? I can’t find it.

There isn’t an option do this. There may be a feature request someone has already put in, but I’m not sure.

You can always post in the Feedback section of the Forums.UnrealEngine.com as a feature request. Epic looks at this section of the forums more than any other. You are more likely to get a response in that section when posting feedback about the engine or want to throw in a feature request.