How do overlap in Xamarin forms?

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Z-Index is established by the ordering of the Child elements in a container element. The first child is at the back of the Z stack, the second child is placed above it, and so on.

The layout container you are using will dictate how each child is positioned. A StackLayout will not allow overlaps. AbsoluteLayout and RelativeLayout will allow overlaps easily. A Grid will allow overlap for elements that extend into the same row and column. None of these have an appearance of their own (think of them as transparent boxes by default). If you want them to occlude the content behind them, then you will need to assign a background color or image, else they will just be painted right on top of the other content.

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