ArcGIS Pro 2.6 API Reference Guide
ApplicationTheme Property

ArcGIS.Desktop.Framework Namespace > FrameworkApplication Class : ApplicationTheme Property
Gets or sets the application's theme that dictates its visual style. Three themes are supported: default (metro), dark, and high contrast.
Syntax
public static ApplicationTheme ApplicationTheme {get; set;}
Public Shared Property ApplicationTheme As ApplicationTheme
Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 7

See Also

Reference

FrameworkApplication Class
FrameworkApplication Members