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You use devices in the Device Mapper very differently from Video Outputs.
Note that there is no Video Output category in the Device Mapper.

You can set in modules and on control boards devices that are mapped in the Device Mapper:

More on Device Mapper and what is its purpose here: https://aximmetry.com/learn/virtual-production-workflow/preparation-of-the-production-environment-phase-i/setting-up-inputs-outputs-for-virtual-production/mapping-devices/

You use Video Output by exposing video pins or using Video Output modules. More about exposing videos here: https://aximmetry.com/learn/virtual-production-workflow/preparation-of-the-production-environment-phase-i/scripting-in-aximmetry/flow-editor/flow-editor/#exposed-video-output-index

Warmest regards,