Theme
Columns lets you preset design preferences in your profile, including default background, font, and color palette. You can also switch between built-in themes with one click.
Theme Browser
You can open the theme browser from the right side of the graph canvas. It lists built-in themes, including:
- default light
- dark
- additional style variants
Reference:

What Is Coming
Theme selection is the first step in a broader template system. Future themes will include layouts and built-in widgets to help you create polished visual stories faster. We will also continue improving built-in themes over time.
Personal Themes
We also plan to support personal theme templates. You will be able to save your own story styles, keep them in your workspace, and publish them to a template marketplace for others to use.
Stay tuned!