我看到微软网站说可以新建窗口，如下，
但是我在visual studio的窗口菜单里找不到新建窗口菜单，咋回事：
Create new windows
You can also create multiple instances of an editor window. This feature allows you to open a lengthy document in more than one instance of an editor, so that you can view and edit different sections simultaneously in separate, full-sized editor windows.

On the Window menu, click New Window.

A new tabbed instance of the editor is added.
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