Hey Eliza! In Funnels, Hold Property Constant applies to all steps in the funnel, not just a subset, so you canβt natively enforce βcan change between Step 1β2, but must match between Step 2β3β in a single funnel. Sorry for not having better news there!
I'd recommend submitting feedback about that (in the ? menu). The product team uses logged gaps to help develop the roadmap, and I definitely see how being able to specify specific steps to hold a property constant would be helpful.