Oracle's VirtualBox virtualization software is a popular choice for users who want to test new operating system versions. If you install Windows in VirtualBox, you may notice that you can't change the default screen resolution of 1024x768.
The low resolution may be sufficient for some tasks, but many may benefit from larger resolutions. The View > Virtual Screen menu of the VirtualBox application lists all available resolutions and scaling options.
The "resize to" options are all inactive, as they are grayed out and not selectable. The scaling options are unlocked and available, though.
How to change the Windows screen size in VirtualBox? - gHacks Tech News
Find out how to change the screen resolution of a Windows virtual machine in Oracle's VirtualBox software.
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