Here [1] is a post by the NoScript developer explaining how the new UI works and which buttons map to which legacy functions. After reading it and letting myself adjust for a few days, I'm perfectly comfortable with the new version.

[1] https://hackademix.net/2017/12/04/noscript-quantum-vs-legacy...

It made me switch to uMatrix, which incidentally also gave me the cookie controls back that I had with the Cookie Monster extension pre-Quantum.

uMatrix is better than the new NoScript.