Linux - VirtualBox Guest Additions limits Screen Resolution

When guest systems with the Guest Additions installed are started using the graphical frontend (the normal VirtualBox application), they will not be allowed to use screen 1249 Advanced topics resolutions greater than the host’s screen size unless the user manually resizes them by dragging the window, switching to fullscreen or seamless mode or sending a video mode hint using VBoxManage. This behavior is what most users will want, but if you have different needs, it is possible to change it by issuing one of the following commands from the command line:

Remove all limits on guest resolutions
VBoxManage setextradata global GUI/MaxGuestResolution any
Restores the default settings
VBoxManage setextradata global GUI/MaxGuestResolution auto