HCL Domino 12.0.2 Early Access Drop 2 has a neat feature to help configure NIFNSF view index separation. Ulrich covers this on his blog post here https://www.eknori.de/2022-06-23/domino-early-access-program-drop-2-is-available/
Our customers have been enjoying this feature for the last 5 years as well as many, many other very handy admin features in our Domino Optimizer product.
See our blog entry here -> https://ab1osborne.blogspot.com/search?q=view+separation+
Why not get WAY ahead of the curve and give the Domino Optimizer a free 30 day trial today?
Welcome to the party HCL! :)