Godot Game Settings (GGS) is a simple tool for the Godot game engine that provides an easy-to-expand base for making in-game settings menus.
The component-based style of the project makes it easy to expand and make your own unique components for your own game.
The project also has several premade components for changing window size, fullscreen state, audio volume, and keyboard controls.
Check the GitHub wiki for more info on using this in your own game and expanding it to fit your own project.
There's also a demo available. You can find the link on the Github page.