We can't switch the initially chosen template at the moment but that feature will be coming soon!
You can change the menu style of your app under Build -> Navigation Menu -> Layout
Choose between 'Drawer Menu' with a top bar navigation and slide out menu or 'Bottom Tabs' where users can access tabs and then a pop out for additional menu items.
You can change all aspects of your app by adding and removing Pages and Components and changing the Design settings in the Build section.
Here you can see what the current templates look like:
https://previewfrankfurter.beezer.com - FRANKFURTER
https://previewevent.beezer.com - EVENT
These are really a starter for 10 to show you what is possible.
If you really want to select a new template you can always sign up again with another email address for a new account. Alternatively we can reset your app to a chosen template.
Below is a link to an example Beezer app:
We hope that helps