Requires Vorapis 2013 (V3) to function. Get it here: https://vorapis.pages.dev/

StarTube is the official successor to CustomTube, allowing you to use the 2008-2024 YouTube layouts. It is highly customizable, and can be used for many things, ranging from just enhancing the default V3 experience, to using an entirely different layout.
Settings are accessed in different ways depending on the layout. Alternatively, click tampermonkey's (or other userscript manager) extension icon to access the settings. An option to reset the settings is also there, which should be clicked in the event that a config issue prevents you from accessing the settings.

StarTube is also available on GitHub: https://github.com/lightbeam24/StarTube