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- Switch off Windows 10
- Make a note of your Operation System current resolution. Let’s say 1900×1080
- Go to the VirtualBox installation folder open command prompt in the folder. Usually in C:Program FilesOracleVirtualBox or Open up a command Prompt and navigate to folder where VBoxManage.exe is..
- Type this command into the command prompt: VBoxManage.exe setextradata “VM-Name” CustomVideoMode1 1920x1080x32
- Open up the Windows 10 and from resolution center change the resolution to your new resolution.