Ok but the reason it is broken really has nothing to do with mobile vs desktop.

It sure seems like the only issues are those on mobile

It's a bug that manifests itself on mobile, but it probably does the same thing on desktop too if you shrink the window really small, and even if it doesn't, it's just a CSS big that is triggered by mobile browsers. There's nothing big that is preventing it from working fine on mobile. Most of the pages do work fine.

But then, how do you test components on mobile? Or are we not supposed to ask that?

Why would you test components that can only be reached on desktop on mobile? These are components to be used inside JetBrains IDE.

It sure seems like people are reaching this on mobile

JetBrains IDEs are not on mobile though. It doesn't matter if they're incidentally accessed on mobile if they're not actually designed to be used on mobile.

These components are not used inside any Jetbrains IDEs. Those IDEs are, of course, written in Java and cannot use a browser-based UI framework. This is for "our web-based products like YouTrack, Hub, TeamCity, and Upsource" (per the original release blog post for Ring UI). Those products support mobile.

They are using Chromium Embedded Framework inside JetBrains IDEs.

use this link for detached view: https://jetbrains.github.io/ring-ui/master/iframe.html?id=co...

Interestingly enough, it doesn't work on mobile because you can't scroll the vertical sections properly.

On the toolbar their is a button to change the viewport size to 3 options small mobile, large mobile or tablet