To navigate to other views in the popup, use the helper method navigateTo found in popup/helpers/navigate. This ensures that you will use the history API to navigate. This is important as the url structure differs slightly between the development and production environment. Using a method like setting window.location to a route, for example, will work in development, but not in production.
When using navigateTo, prefer using the enum ROUTES from popup/constants/routes rather than writing out the path.