Switch between headphones and monitors

I recently hooked up a pair of KRK monitors into my UR12 using the RCA output connectors. I record interviews in Adobe audition, where I also do all my editing.

Up until now, I’ve always worked on a pair of studio headphones and built in or bluetooth speakers, so whenever I wanted to switch between speaker or headphone, I would just change the output from the Steinberg interface to the built in output. Now that I have both speakers and headphones plugged into the UR12, whatever is playing in the speakers is also playing in the headphones, which means I can’t record with direct monitoring through just the headphones and not the speakers.

Is there a simple way to switch between my headphones and my speakers either through the Steinberg hardware or some software?

following. need the same resolution. otherwise need to return the product

The unit assumes your monitor speakers have their own amplifier and volume control

Source: https://download.steinberg.net/downloads_hardware/UR12/UR12_documentation/Manual/ur12_en_om_a0.pdf