thanks all for sharing feedback & bumping this again!
We are planning to launch a fuller wide mode that will allow for columns to take up the full width of a page while maintaining a clean viewing experience on any device. Given the Coda page is ~800px wide when centered/1000px wide when wide, for now four columns prevents content from getting too clunky as we’ve seen in some other products with a similar feature.
Coda happily assumes the role of ensuring anything our users create looks great for whoever views it, whether a teammate or someone who uses a template. We want you to share customized docs with confidence. I can promise you will be sharing your fully-wide pages with columns with an immaculate viewing experience soon. 