When an Anchor is set, the HorizontalOptions & VerticalOptions properties will be used to position the Popup in relation to said Anchor.
For example, a Popup which sets its Anchor on a Button & has its HorizontalOptions & VerticalOptions properties set to LayoutOptions.End will be positioned at the bottom right of the Button.
Without any Anchor, the Popup will use its parent or the main window as a virtual anchor to position itself, while still using the HorizontalOptions & VerticalOptions properties as guides for its positioning.
Target Platforms: Windows 11, Windows 10, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2