Request: Add functionality like ShowDesktopOneMonitor

### Description of the new feature / enhancement

It would be great if PowerToys could add a feature similar to ShowDesktopOneMonitor.

### Scenario when this would be used?

This feature is particularly useful when a single host machine is running multiple monitors at the same time.

### Supporting information

_No response_

No file, test, or entry point is identified in the issue. Start by researching the referenced ShowDesktopOneMonitor behavior and locating the PowerToys utility responsible for multi-monitor desktop visibility; done should be defined as a reviewed implementation that matches the agreed behavior on multiple monitors.

Written by the indexing model from the issue text.