Installing Guest Additions is very easy on a Windows Virtual Machine and you shouldn’t encounter any issues. You can only access the option you need to enable true full-screen if this package is present. The first thing you should do is install Guest Additions on the VM. Here’s a step-by-step explanation of these processes. If you want this display to fill up the entire screen, you need to execute additional tasks. The Window goes to full-screen mode but the display remains the same and occupies the central position. While the above option is called Full Screen Mode, it doesn’t actually change the size of the Virtual Machine display. How to Make VirtualBox Actually Full Screen If you want to change this key or the shortcut, you need to go to File > Preferences > Input > Virtual Machine.The Host key is the Right Ctrl by default and you can see the current host key on the bottom-right of the VM window.You can also use the Host Key + F shortcut to enable/disable this mode. However, if you want to open the VM without its menu or the Taskbar, you need to select Full-screen Mode.

The Maximize button on the Virtual Machine’s window extends the window to the whole screen. How to Select Full-Screen Option on VirtualBox? How to Make VirtualBox Actually Full Screen.How to Select Full-Screen Option on VirtualBox?.

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