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Created attachment 19842 [details]
Sample replicating the issue is attached
When a button is set as the content of the ContentView, the button is not layout in FillAndExpand LayoutOption
You can replicate the issue in the sample attached.
I ran the attached project (which is using Forms 126.96.36.199) but I don't believe I was able to reproduce the issue. On all platforms the yellow button filled the entire page. And if I set the LayoutOptions to "Start", "Center", etc it would also work as expected.
What are you seeing when you run the attached project? Also, what platforms(s) you are experiencing this on?
Created attachment 19919 [details]
Screenshot replicating the issue is attached
I provided the screenshot replicating the issue. In the screenshot you can see the yellow button having a Aqua border for the LayoutOption "FillAndExpanded". The background of the parent (aqua color is given as background to the parent) is in the view, replicating the issue that the button is not FillAndExpanded. I am able to reproduce this issue in Xamarin.Forms(Android).
Created attachment 19937 [details]
native android project
The space around the Button is from the native Android Button's default background which has transparent pixels around the sides. I've attached a native Android project that shows this is the default behavior.
You can use a custom renderer to provide your own background drawable or color in order to eliminate the extra space.
Marking as RESOLVED per info in comment 3