The catalog content can only be manipulated if the active window in the application is the catalog dock pane. See IsActiveWindow. Otherwise requests to change the displayed content type or secondary portal content type will be ignored. The CatalogContentType.Portal content type must be the current content type to change the CatalogSecondaryPortalContentType.
Example
Get the catalog content type currently being shown
{
//Gets the Catalog pane
var catalogWindow = Project.GetCatalogPane() as ICatalogWindow;
var catContentType = catalogWindow.GetCurrentContentType();
// use catContentType;
}
Requirements
Target Platforms: Windows 11 Home, Pro, Enterprise (64 bit)