I just installed Vanity with redis. I've added multiple experiments on one page. But when a user is visiting the page, he is seeing all the experiments.
How can I make sure that a user will only see one experiment and that Vanity chooses which experiment the user will see?
It sounds like you're asking how Vanity could be configured to show the default for all but 1 experiment on a given page.
Currently Vanity experiments are independent of each other, so there's no notion of "being shown to the same user at the same time". This Github issue looks like it's tracking a related feature request.