Hi developers!
I tried “GUI Editor” which has been released as beta since v5.
I think it has great potential. Here are game title and setting screen examples.
An example of GUI created by “GUI Editor” in Babylon.js v5 - YouTube
I’ll write an explanation an interpretive blog post regarding how to use GUI Editor, tips and limitations soon.
Love to see it being used like this 
Awesome! Love the big bold style of this GUI, and I’m already excited to see your post! 
@carolhmj
Thanks for your comments!
I think GUI Editor has great potential then I’ve posted two blog regarding GUI Editor.
What is GUI Editor and How to use it.
Babylon.js v5で正式に追加されたGUI Editorの使い方をまとめました - CrossRoad (crossroad-tech.com)
How to control the created GUI on Babylon.js code.
Babylon.jsのGUI Editorで作ったGUIをソースコードから制御する方法 - CrossRoad (crossroad-tech.com)
Currently the two info are only Japanese but I can write them in English if necessary
It would be awesome to see them in English to share with even more people! Even through I don’t understand japanese (I really should commit to learning someday…), I can see you took a lot of care to explain things, with lots of pictures 
I’m glad to hear your comment!
I’ll write English version posts since next week.
Today and tomorrow I have to prepare the following meetup. It is the first Babylon.js meetup in Japan
Babylon.js 勉強会 vol.1 ~Babylon.js 日本コミュニティ立ち上げ記念！~ - connpass
Have fun on the meetup! I bought some Japanese candy today so I’ll eat them wishing for its success! 
Great thanks for your much preparation like Japanese candy!