The idea is to have tabs on separate pages in the Gallery (or the option to allow that type of behavior). Right now, if you created an analytic app that has questions on different tabs they will be on separate pages in Designer, but when you push the workflow to the Gallery all the questions will be on the same page. The tabs act as a navigation bar instead of taking you to separate pages.
Here's two different discussions that ask about this in case there is any confusion:
https://community.alteryx.com/t5/Alteryx-Server-Discussions/Interface-Designer-with-TABS-in-the-serv...
https://community.alteryx.com/t5/Alteryx-Server-Discussions/Analytic-App-Tabs-in-Gallery/m-p/846477/...