UR12 Interface recording ALL SYSTEM AUDIO going through headphones


My UR12 audio interface is connected to mic through mic input and to headphones through phones output. When I use a metronome, I want to hear it in my headphones along with sound captured thruogh microphone. Unfortunately, the interface records everything you can hear through headphones - so the metronome clicking is also recorded. It makes overdubbing impossible, as if I try to record another layer, all the previous layers are recorded as the are on the playback.

It used to work fine. How to be able to hear system audio through the headphones without recording it?
I’m on win 10
Please help