2023 no live preview

hi,
No there is no preview for block themes
better to create a test site to familiarize with the theme, it has a lot to offer, but you need a little time to understand how it works.
That’s what i did

Just create a test site and play with it

Hi
Thanks. Will do.
Thought that must be the case. But then, why …?!

i think you will find answers to your question here : https://make.www.ads-software.com/core/2022/01/07/state-of-the-customizer-with-block-themes-in-wordpress-5-9/#:~:text=State%20of%20the%20Customizer%20with%20block%20themes%20in%20WordPress%205.9