ArcGIS Pro 2.7 API Reference Guide
VisibilityWhenHidden Property
Example 

ArcGIS.Desktop.Framework.Converters Namespace > VisToBool Class : VisibilityWhenHidden Property
Gets or sets the Visibility to check. The default is Visibility.Collapsed.
Syntax
public Visibility VisibilityWhenHidden {get; set;}
Public Property VisibilityWhenHidden As Visibility
Example
<frameworkConverters:VisToBool x:Key="BoolToVisibleHidden" Inverted="True" Not="False" VisibilityWhenHidden="Hidden"/>
Requirements

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

VisToBool Class
VisToBool Members