Oracle VM VirtualBox menu bar is missing, which may be set to full screen or seamless mode, and can be modified by corresponding shortcut keys.

VirtualBox is an open source virtual machine software. VirtualBox is a software developed by Innotek in Germany and produced by Sun Microsystems. Written in Qt, officially renamed Oracle VM VirtualBoxSun was acquired by Oracle Bone Inscriptions.

Innotek publishes VirtualBox with GNU General Public License (GPL), and provides binary version and OSE version of the code; Users can install and execute Solaris, Windows, DOS, Linux, OS/2 Warp, BSD and other systems on VirtualBox as client operating systems.

The steps to make the menu bar appear again are as follows:

First of all, the corresponding shortcut keys are:

1. Full screen mode host+f;

2. Seamless mode host+L;

3. Auto zoom mode host+C;

Note: where Host (default) is the Ctrl key on the right.

2. Then you can switch to the corresponding mode through the corresponding shortcut key above, and press the corresponding shortcut key again to exit from this mode to the window mode normally;

3. Finally, try it alone:

Right Ctrl+F, right Ctrl+L, right Ctrl+C

There must be a key to exit the normal mode.