UE4 Minimal is an attempt at a dark theme for Unreal Engine 4. Currently compatible with UE4.20 and up. This theme works by replacing images in UE4’s Engine/Content folder.

Instructions

• Navigate to your Engine\Content folder.

• Make a copy of these two folders: “Editor” and “Slate” this will be your backup if you would like to revert the theme,
  otherwise you’ll have to reinstall the engine.

• Download or clone the repo, and copy the “Editor” and “Slate” folders into your Engine/Content folder.
  You will be asked to override a few thousand files, hit yes.

• Should you want the Graph Nodes in blueprint/material editor to be the old versions,
  Do not copy and replace the “Editor/Slate/Graph” folder.

• Once all is done, open the editor and enjoy your new minimal theme.