How to make first column (with row selection) a specific width

[coreybruyere]

I'm trying to make my first column of input boxes a set width. After reviewing the docs it looks like I need to combine useFlexLayout along with a hook to modify the width, minWidth, and maxWidth of the first column. I tried doing that on the sandbox linked below and am unable to styled the first column as desired. Am I missing something here?

https://codesandbox.io/s/competent-shaw-n665e?file=/src/App.js