Howdy! If I’m not mistaken you’re looking to enable the fast preview denoiser?
If so it is still there its just called a little differently and it gives you more options. Now it is called “Denoising during rendering” under the Interactive Rendering compartment (its in your screenshot).
Just set it to Optix or Intel - Optix tends to be a little faster (Nvidia GPU) but a little less detailed whereas the Intel denoiser (Nvidia GPU or AMD / Intel CPU with AMD GPU support getting looked into) tends to be a little bit slower but a bit more detailed.
As a general note, it would be great it the Corona team could provide a “maxscript documentation update” when changes like these are made. It seems the last few versions I’ve had to go back and fix a bunch of scripts for things like this because the names have changed.
Not tricky to do, but frustrating when the studio updates and everyone starts telling you it’s “broken”
The documentation was in a migration process and it should be available soon.
Not sure though how each changelog for maxscript with each release will be.