My UI does not appear to have a provision for connecting Flow Pages (or their settings) with a Route Group. When I click on Routes within a page, there is nothing indicating a way to link to the Route groups anywhere (although Gemini keeps telling me there is or that there ‘should be’.)
Route Groups are collections of routes—reusable routing logic in Dialogflow CX that allow you to manage repeated intent and condition handlers across multiple pages or flows.