Hello,
The Maui team has answered this issue for this situation HorizontalOption End does not work on a HorizontalStackedLayout on both Android and iOS #20952. This is an expected design and not an issue.
@czuck I'm pretty sure this is by design. Horizontal StackLayout just measures to the width of all the controls so it will ask the control what size it wants to be with infinite space. It isn't going to have empty space on the left or right. You most likely want to use a grid for this scenario.
Best Regards,
Alec Liu.
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