Guys, there is super easy way to create Circle/Round buttons in XF.
What you need to do is to use BorderRadius, WidthRequest and HeightRequest (you must use all these properties)
Make in mind simple formula:
WidthRequest = BorderRadius * 2
HeightRequest = BorderRadius * 2
or another way:
BorderRadius = WidthRequest / 2
BorderRadius = HeightRequest / 2
So finally, if your WidthRequest and HeightRequest both are equals 40, then your BorderRadius will be 20.
See the attached screens for this simple and nice hack