How to make default (auto generate) master detail page work?

In Visual Studio 2017 Windows version. After I create MasterDetailPage, it auto generate 3 XAML files but the menu is broken, how to fix this? Master.Mater page is covering up the whole MasterPage (with hamburger menu)
Main view

Menu view

When I try to read the document here:
The code is totally different with auto generate code, what should I use?

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