Hey @chloewarren ! Welcome to the Typeform Community!
I totally understand the confusion over this. We've been working on a different pricing structure and it seems you are on the latest version of these plans, but there are customers on different legacy versions and the access to the features might be different according to it.
In fact, the redirect feature isn’t part of the Start plan. However, the redirect on completion has never been available for free users.
Hope this helps! Let us know if there is anything else the community team can do for you.