How to change Xamarin Android/IOS Application Name ?

Right click on your project-Android -> Options -> Android Application ->  Change application name.  Then rebuild

If it didn't change then go to MainActivity.cs

[Activity(Label = "ProjectName", Icon = "@mipmap/iconname", Theme = "@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]


IOS:
Go open info.plist then change Application name


Rebuild- then Run again