为了能够在任何虚拟机上使用多个监视器上的^{(Multiple Monitors)}VirtualBox，您需要更改默认设置。如果您有双显示器设置，并且您想将两个屏幕与您的客户操作系统一起使用，这篇文章将为您提供指导。与VMware一样，VirtualBox不会检测到第二台显示器，除非您进行一些更改。这将帮助您更改特定设置，以便您可以开始使用多台显示器。

将 Dual Monitor^{(Use Dual Monitor)}与VirtualBox虚拟机一起使用

您需要执行这些步骤来为VirtualBox虚拟机启用双显示器-

1. 安装 Guest Additions CD 映像
2. 允许第二台显示器
3. 启用第二台显示器
4. 扩展显示。

要开始使用，您需要安装Guest Additions CD 映像。由于您的VirtualBox^(VirtualBox)安装随附此软件包，因此无需下载任何其他内容。默认情况下，它不安装软件包，但这是获得无延迟用户体验所必需的。

要安装Guest Additions CD 映像，请打开VirtualBox，启动来宾操作系统并确保您已登录到系统。

之后，转到设备^(Devices) > Install Guest Additions CD映像。或者，您可以按右Ctrl + D。

您应该会在屏幕上弹出一个窗口。按照屏幕说明完成安装。之后，您需要将第二个监视器添加到您的虚拟机。为此，打开VirtualBox >选择虚拟机 > 单击设置^{(Settings )}按钮。

然后，转到“显示”^{(Display )}部分并确保您位于“屏幕”^{(Screen )}选项卡中。从这里，您需要为您的虚拟机分配最大的视频内存。为此，请使用视频内存^{(Video Memory )}条提供最大可用视频内存。其次，在Monitor Count框中选择两 (2) 个。^{(two (2) )}

这两个设置是强制性的。但是，如果您想要更好的性能，您可以选中启用 3D 加速^{(Enable 3D Acceleration )}复选框。完成所有更改后，单击“确定^{(OK )}”按钮保存。

现在启动您的虚拟机并同时按Host + F按钮。默认情况下，右边的Ctrl是Host按钮。之后，您必须将虚拟屏幕分配给主机屏幕。为此，请转到View > Virtual Screen 1 > Use Host Screen 1。

同样，转到View > Virtual Screen 2 > Use Host Screen 2。现在您可以在两个监视器上找到虚拟机。此外，如果需要，您也可以将主机屏幕 2^{(Host Screen 2)}用于虚拟屏幕 1^{(Virtual Screen 1)}。

我希望这个简单的解决方案对您有所帮助。^{(I hope this simple solution will be helpful for you.)}

阅读下一篇^{(Read next)}：如何在 VMware 虚拟机中使用双显示器。

How to use Dual Monitor with VirtualBox virtual machine

To be able to use VirtualBox on Multiple Monitors wіth any virtual machine, yoυ need to change the default settings. If you have a dual monitоr setup and you want to use both screens wіth your guest OS, this post will guide you. Likе VMware, VirtualBox doesn’t detect the second monitor unless you make some changes. This will help you change the specific settings so that you can start using more than one monitor.

Use Dual Monitor with VirtualBox virtual machine

You need to carry out these steps to enable dual monitor for VirtualBox virtual machine-

1. Install Guest Additions CD image
2. Allow the second monitor
3. Enable the second monitor
4. Extend display.

To get started, you need to install the Guest Additions CD image. There is no need to download anything else since your VirtualBox installation comes with this package. By default, it doesn’t install the package, but this is required to get lag-free user experience.

To install Guest Additions CD image, open VirtualBox, start the guest OS and make sure you are logged into the system.

After that, go to Devices > Install Guest Additions CD image. Alternatively, you can press right Ctrl + D.

You should get a popup on your screen. Follow the screen instructions to finish the installation. After that, you need to add the second monitor to your virtual machine. For that, open the VirtualBox > select the virtual machine > click the Settings button.

Then, go to the Display section and make sure you are in the Screen tab. From here, you need to assign the maximum video memory to your virtual machine. For that, use the Video Memory bar to provide the maximum available video memory. Secondly, select two (2) in the Monitor Count box.

These two settings are mandatory. However, if you want better performance, you can select the Enable 3D Acceleration checkbox. After making all the changes, click the OK button to save.

Now start your virtual machine and press Host + F buttons together. By default, the right Ctrl is the Host button. After that, you have to assign a virtual screen to a host screen. For that, go to View > Virtual Screen 1 > Use Host Screen 1.

Similarly, go to View > Virtual Screen 2 > Use Host Screen 2. Now you can find the virtual machine on both monitors. Also, if you want, you can use Host Screen 2 for Virtual Screen 1 as well.

I hope this simple solution will be helpful for you.

Read next: How to use dual monitor with VMware virtual machine.

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