Hi,
I don’t see the option to select them when I start the program, at what point does it come up?
I have updated the software.
Log in to the game and start it (the full game, not the pre-game login screen).
You should see the choice of two worlds on the first screen, at the top.
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Perfect, embarrassing that I didn’t see that…
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On re-reading your post I wasn’t sure if you meant “routes” or “worlds” – but routes are at the top of the screen too anyway. 
Hi,
I have same issue, well almost the same.
I can see the option to choose the worlds on my Win10 OS, but cannot see this option under MacOS tablet. Any suggestions?
Make sure the Zwift app is fully up to date on the Mac.