When you first create a database, you'll need to choose the layout of the default view. After this, you'll see the option to create additional views as tabs, with the + button. Your database can have as many views as you want!
Give your view a name in the text box, and choose the type of layout you want.
When you have multiple views, you'll see them listed across the top of your database as tabs.
There are six different ways to visualize your content within a database. Here's a high level overview of each layout: