Comment 6 for bug 1645862

I can definitely see how it may be confusing on how values should be entered - essentially, it copies the functionality of the workstation setting, so the anticipation is that the user will be able to save their adjustments via the grid itself. Manually, you're creating/editing an object that should look somewhat like this: https://gist.github.com/khuckins/a919d04e856ca177683b4a00dfa3bc7e

The widths themselves are flex values associated per column, and are whole numbers starting at 1. Most column widths begin at 2 by default. A release notes might help out here