To have your Windows 7 virtual machine displayed in full screen on Oracle VM VirtualBox Version 7.0.4 r154605, you need to install the “Guest Additions.” This can be accomplished by going to the top menu and selecting “Devices,” then choosing “Insert Guest Additions CD Image.” After opening the VBoxWindowsAdditions.exe file, follow the on-screen instructions to finish the installation process. Finally, restart the virtual machine and navigate to the “View” option in the top menu and select “Full-screen mode.