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If you go to Windows 10 display settings (right click the desktop and select Display settings in the context menu), you can increase the guest OS resolution, but you still have no ability to switch the full screen mode on. You can also enable 2D and 3D acceleration. It is recommended that you set 128 MB of video memory, as when a video mode with higher resolution is used, more video memory is needed. If you try to maximize the VirtualBox VM window right after installing Windows 10 on a VirtualBox VM, the size of the guest OS user interface is not increased (see the screenshot below).Ĭheck the amount of video memory you have in the virtual machine settings. As you recall, VirtualBox is installed on the host OS running on a host machine (a physical machine) and the guest OS is the operating system running on a VM. You can disable the internet connection or set up a virtual network adapter for a VM in the Host Only mode to allow network communication only between host and guest systems, and deny connecting the Windows 10 guest to external networks, including the internet. If security is a concern for you, running Windows 10 as a virtual machine (VM) on VirtualBox is a good idea. How to Make VirtualBox Full Screen for Windows 10 Guests

Don’t worry, as it is possible for you to increase the screen resolution of the guest OS user interface as well as run a guest OS in the full screen mode for macOS, Linux and Windows guest OSs. In the majority of cases, working in a guest OS with low resolution is not comfortable. Moreover, the size of that window is usually not big, and if you maximize the window’s size, the resolution of the guest OS user interface is left the same. After installing a guest operating system (OS) on VirtualBox, the interface of the guest OS is displayed in a windowed mode by default.