In case this helps anyone who gets bored after a day or two with any of the Zwift courses, you can change your preferences to force Zwift to give you London, Watopia or Richmond on any day of the week, not just the allotted ones on the monthly schedule. Take care, and be aware of the advice that there are no hidden courses (allegedly). So don’t, as a computer scientist might, try other changes to see what happens and where you might be taken! Your rides might be a little more lonely than usual when making an alternate choice, of course…and I presume there might not be any races or group rides organised “off-piste” so to speak…
Important: Do not insert bogus values into your preferences file!
There are no “hidden” courses, secret maps or back doors which can be found by inserting the wrong values into your prefs.xml file. If it’s invalid, Zwift will just behave unpredictably or even crash. Follow these instructions carefully and you’ll be safe!
PS I would recommend iMazing as a Mac based IOS file manager rather then the one suggested in the zwiftblog link. See the reasons here https://www.entertainmentbox.com/itunes-update-breaks-ifunbox-vshare-alternative-fix-imazing/