June 23 Update:
Thank you for your patience! CSG v3 is back for you to try!
We’ve been working to significantly improve our CSG system. Specifically, we’ve made it way faster and fixed a number of issues - for example, unions shouldn’t disappear anymore.
We will be deploying this in-game eventually, but we want you to try this new beta in Studio to help us ensure it works perfectly for you.
To enable this, go to File > Beta Features and enable “CSG Version 3”.
There will be no visible change as the tools are the same, but the system should be way faster (up to 20x in some cases), and we will be making it even faster during the beta.
Give it a try, and let us know what you think! We have some great things planned using this new system, and we want to make sure you love it before we enable it by default.
The Roblox Team