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Do you want to achieve the result like following screenshot?
If so, please open your Home page. And add ToolbarItems
<ContentPage.ToolbarItems>
<ToolbarItem Text="New"
Icon="icon.png"
Priority="0"
Order="Primary"
Clicked="ToolbarItem_Clicked"/>
</ContentPage.ToolbarItems>
======================
Update========================
If you want to add number above cart icon, you can refer to this thread.
Best Regards,
Leon Lu
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