I have a component which has a z-index set to a larger value. Even if it's set to 1 when I scroll left to right the component loads over the react-styleguidist sidebar. I couldn't find any documentation regarding overriding the z-index via the styleguide.config.js.
Adding the zIndex to sidebar property in the styleguide.config.js solved my problem. Here is the snippet I needed to add to override the z-index in the config file.
module.exports = {
styles: {
StyleGuide: {
sidebar: {
zIndex: 3
}
}
}
}
Discovered this via hit and trial method as I was typing the question.