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.
Difference between hiding & disabling a column
'Hiding' a column happens in the Data tab. When you hide a column, guests to your App won't be able to see that column, but you and collaborators of that App will still be able to use it.
'Disabling' the column happens in the column settings menu. When you disable a column, neither you nor guests will be able to see or use that column in the Polymer App. But don't worry, you can enable the column again later if needed.
What a split cell is & how you can split a cell in Polymer
A cell of data that contains multiple values, like "Dallas, Texas, United States" contains the city, state, and country, can be split to span three columns instead of one.
To do this, you can opt to split that cell's value in the column settings and enter the custom separator. In this example, the custom separator would be a comma.