The Character Editor Tools is used for randomizing Customization Data Assets directly inside the Unreal Editor.
The following video shows the Character Editor Tools until timestamp 5:05.
[YouTube aI-Glv1YYrU]
Technically, it relies on the Package Registry and you can open edit by right-clicking on EUW_CharacterEditorTools
in the Content Browser > Run Editor Utility Widget. This will open the window, shown above.
There you can follow the instructions, mentioned in the two light gray boxes. The main rules to be able to edit a character, are:
The Character Editor Tools also work with your custom characters.
The Character Editor Tools also work during Play in Editor (PIE) sessions, but the randomization will not update the selected CDAs inside the in-game editor. Currently, the in-game editor has its own set of CDA references and is not connected to the Package Registry, yet.