Customizing data in Polymer
Customization of data happens in the column settings. You can access column settings 2 ways:
First, by opening the 3 dot menu to the right of each column name.
Second, through the gear icon that you'll find at the bottom of that menu or in the top right corner of your Polymer App.
Here you will find settings to change column title, data type, and reorder or hide columns among other options.