In this video, I will be discussing how to fix VirtualBox full screen not working issue. If you're experiencing issues with VirtualBox's full screen mode, you may notice that the display only occupies a portion of the screen, or you may be unable to enable full-screen mode altogether.

Installing VirtualBox Guest Additions can help improve the graphics and performance of your virtual machine, and also enable full-screen mode.

Here are the in-depth steps to install VirtualBox Guest Additions:

Step 1: Start your virtual machine
First, start your virtual machine that you want to install Guest Additions on.

Step 2: Insert Guest Additions CD image
Next, go to the VirtualBox menu and click on Devices --- Insert Guest Additions CD image. This will insert a virtual CD into your virtual machine that contains the Guest Additions software.

Step 3: Run the Guest Additions installer
Now, navigate to the virtual CD in your virtual machine and run the Guest Additions installer. The installer will guide you through the installation process.

Step 4: Follow the installation prompts
Follow the prompts to complete the installation. You may be asked to agree to the software license agreement and to enter your administrator password.

Step 5: Reboot your virtual machine
Once the installation is complete, reboot your virtual machine to apply the changes.

Step 6: Enable full-screen mode
After rebooting, go to the VirtualBox menu and click on View --- Full-screen Mode or press the Host key + F to enable full-screen mode.

By following these steps, you will be able to install VirtualBox Guest Additions and enable full-screen mode on your virtual machine, which should fix the VirtualBox full screen not working issue.

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