To set a default view in an app for your team you can today do this by saving a new, or edit a current view.
What you do is to first make sure it's a 'Team view' and then place it's so that it's the first view, placing it just under 'All items' in the left sidebar.
You can drag and drop the saved view by clicking on the arrows that comes up when holding the cursor over the view. And to edit it you use the wrench. The view that is placed under 'All views' in the left sidebar is going to be the default one for your team.
The layout you've chosen in your app settings does only affect the first default 'All items' view in the app.
I hope this makes sense and will come in useful for all of you!
/Charlie - Podio