Limitations and Best Practices for Defining Custom View Parameters at the Root Level in Ignition Perspective

How many custom parameters can we make on root level of an perspective view?

I don’t think there is a limit. When you start getting to a large number of parameters, it could be useful to organize them in groups via objects.

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There's no limit enforced, but I wouldn't put more than a few dozen, mostly from a maintainability standpoint. Definitely group them into logical "namespaces" using objects. Also mark them all private.