It means Star, It's the equivalent to GridUnitType.Star. Star means take up as much room as possible.
Check out here for more information:
https://developer.xamarin.com/guides/xamarin-forms/user-… (View Post)
It's because you're saving an empty canvas. You need to redraw the inProgress and completed lines on the save button click from the lists you already have.
foreach (var path in completedPolylines)… (View Post)