I know people that do not like the new Dark Mode in the macOS. I am not one of them. I have been using Dark Mode since it came out in macOS Mojave. I have gotten used to it even though it is still not implemented well in a few of the third party Apps I use. This article describes pretty much everything you need to know about Dark Mode and how to use it. If you have not tried Dark Mode yet, give it a try. It might be just what you were looking for.