Its like they took a look at the windows 98 ui and decided thats how their app should be, exactly. It even has a start button, and everything opens as a "window" in the browser screen.
And even worse, i initially thought it was some theme someone applied, but no, it was literally intentionally designed like that, and theres no alternative theme or formatting
i built something similar for my own site but with a macOS vibe - https://thisisharsh7.github.io