We’ve heard Zwifters voice concerns about the Ride of the Week challenges being difficult to plan in the Zwift Companion app. We are reverting to separate Route of the Week and Climb of the Week starting July 20 / 21 (depends on your local time zone).
You can find the currently active worlds in the Routes menu in Companion. They are at the top of the list and say “Active Now”. There is also a little calendar icon in the upper right corner of the Routes menu that shows the rest of the month. (Though it also says “Worlds change at 00” and I have no idea what that means.)