As an alternative, you can press the combination of the VirtualBox Host key and F. After making the configuration explained above, you can enable the full screen mode for your Windows 10 VM by clicking View > Full Screen mode in the VM window. We are now close to answering the “how to make VirtualBox full screen Windows 10” question. Now you can maximize the VM window size of the Windows 10 guest. The resolution of the user interface of guest Windows 10 is automatically changed. Move the mouse pointer over the corner of the VM window, push the left mouse button and change the size of the VM window. In the VM Window menu, go to View and make sure that the Auto-resize Guest Display option is enabled. Once VirtualBox Guest Additions are installed, you can see a different set of resolution settings in the Windows 10 guest. After finishing the installation, reboot the VM. The process of installing Guest Additions is quite straightforward. In the guest Windows system open Windows Explorer, go to the virtual CD drive (disk D: in this case) and run VBoxWindowsAdditions-amd64.exe file to install VirtualBox Guest Additions on the Windows 10 guest. In the VM window, go to Devices > Insert Guest Additions CD image to insert the ISO disk into the virtual CD drive of the VM. In order to fix this issue and make VirtualBox full screen, you should install VirtualBox Guest Additions on the guest OS. If you try to enter the full screen mode by clicking View > Full screen mode in the VM window or by pressing the combination of the VirtualBox host key and F ( Right Ctrl + F in this case), the guest OS screen will not be stretched to the size of your display and resolution will not be increased. For example, in our case the resolution of the monitor is 1920×1080 and the maximum resolution in the Windows 10 guest settings is 1600×1200 (available resolution settings of the guest OS are not for widescreen displays, as you can see). 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. My host OS is Windows 7 64-bit, and I'm running VirtualBox 4.1.18.DISCOVER SOLUTION How to Make VirtualBox Full Screen for Windows 10 Guests I tried increasing it to 256MB, but with no effect: the guest is still six pixels too narrow. When I created the VM, its display memory was already defaulted to 128 MB. This answer suggested giving the VM 128MB of video memory, and claimed no problems getting 1366x768 afterward. I'm using version 4.1.18 and seeing the same problem they claim to have fixed, so either they broke it again, they were wrong about ever having fixed it, or my problem is something else entirely. This user had the same problem, but the accepted answer is "install the Guest Additions", which I've already done that got me to 1360, but not to 1366.Īccording to the VirtualBox ticket tracker, there used to be a bug where the guest's screen width would be rounded down to the nearest multiple of 8, but they claim to have fixed the bug in version 3.2.12. So there's a three-pixel black bar at the left and right sides of the display. When VirtualBox is "fullscreen", the guest is only 1360x768 - six pixels too narrow. The problem is, VirtualBox refuses to run the guest at 1366x768. Windows 8 disables some of its features if the resolution is less than 1366x768, so I need to run the guest OS fullscreen. I'm trying to run Windows 8 in VirtualBox.
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