Click the ellipsis icon in the top app bar to access the More menu and choose Settings.

Select Organization, then choose Categories.

Add a new category by clicking Add New.

Remove an unwanted category by clicking the X next to its name.

Re-order and prioritize categories using the handles on the left side.

Rename an existing category by clicking its name.

Change the color of a category by clicking the color circle on the left side.

When you're done, click the X in the upper right corner to close the Categories list.