I'm not sure if this is what you want but if you double click on the "XAML" or "Design" tabs in-between the two panes it will maximize that tab and you can then use the tabs to switch back and forth between design view and XAML view.
Hope this helps
Edit: If you want to go back to split pane view there are three very small icons at the bottom right and you can click one of those to either split vertically or horizontally. The one with the double arrows will also let you switch back and forth between single and split pane views.
Edit: I found this on MSDN which makes it seem that they had the split view so that
...if you drag a control from the Toolbox to Design view, the XAML is immediately updated to reflect the new element. Likewise, if a new element is added by typing the markup in XAML view, the visual representation will appear in Design view immediately, once the XAML is correctly formed.
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我不确定这是否是您想要的，但如果您双击两个窗格之间的“XAML”或“设计”选项卡，它将最大化该选项卡，然后您可以使用这些选项卡在两个窗格之间来回切换设计视图和 XAML 视图。
希望这有帮助
编辑：如果您想返回分割窗格视图，右下角有三个非常小的图标，您可以单击其中之一来垂直或水平分割。带有双箭头的窗口还可以让您在单窗格视图和分割窗格视图之间来回切换。
编辑：我发现MSDN 上的这个 这使得他们看起来有分割视图，这样
编辑3：看起来有人之前找到了答案。您可能想尝试这个：
在 VS2010 中将设计器与 WPF 的 XAML 窗口分离< /a>
I'm not sure if this is what you want but if you double click on the "XAML" or "Design" tabs in-between the two panes it will maximize that tab and you can then use the tabs to switch back and forth between design view and XAML view.
Hope this helps
Edit: If you want to go back to split pane view there are three very small icons at the bottom right and you can click one of those to either split vertically or horizontally. The one with the double arrows will also let you switch back and forth between single and split pane views.
Edit: I found this on MSDN which makes it seem that they had the split view so that
Edit 3: Looks like someone found an answer before. You may want to try this:
Separating designer from XAML window for WPF in VS2010