ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Desktop.Mapping Namespace / PopupDefinition Class / Size Property
Version

Size Property (PopupDefinition)
Gets or sets the size of the popup window. When set to null, a default size will be used. Only used when dockable is false or the dockable window is floating.
Syntax
public Nullable<Size> Size {get; set;}
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.
See Also