Hello everyone! Thanks for taking the time to read this!
(with the GLFW version found on LWJGL 3.1.0)
Using an undecorated window, glfwMaximizeWindow works perfectly fine on Linux Mint 18, but on Windows 8.1 and 10, the window hides the task/start bar, sizing itself as a full-screen window, but allowing movement and resizing (through a custom frame), meaning it's not really a proper full-screen either.
The original window size is 1280x720, and the screen resolution of the Windows 8.1 computer is 1900x1600. The resolution of the Windows 10 computer is 1600x900.