How to add white bar in Visual code?

Hello , I am in the middle of my project . and need to ee my page how it will appear. I have seen somebody had before on their page.
Please advice me : how to turn it on ( white bar on the right). I have added screen shot of someody’s visual code project.
Picture is attached

That looks to me like they just have a browser window open and next to VSC. Notice that it is not contained in the VSC window and is not under the VSC banner. They just have it set to whatever address the server is serving to. That being said, there are packages like this. I’m sure there are others.

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