fluid.bufnoveltyslice greyed out in Batch Processing example file

From this page in the learning section of the website

https://learn.flucoma.org/learn/batch-processing/

<img width="640" height="367" alt="Image" src="https://github.com/user-attachments/assets/1e670744-4991-4e19-8c9d-8f4faa0186df" />

