A lot of Looker visualization types allow you to edit names of series, which is helpful in ensuring visuals display an accurate name for things where other filters or pivots are applied.
However, this is not currently possible with funnel visualizations. Is that planned for a future release?
The current state of things is a bit of a downer, since templated filters make it convenient to allow savvy users to create custom conversion funnels on top of your event data – but since users can’t re-label the funnel measures themselves, they’re stuck with a visual that says things like “Funnel Step 1”, “Funnel Step 2”, etc., rather than something more interpretable like “/Home”, “/Shop”, “/Basket”, or somesuch.
It’s currently possible to work around this by creating table calculations that point directly to the measures, only with different names, but that seems like a bit of a hack.