When my LG monitor sleeps I have no audio, (has built-in speakers)

Question

I have an LG Ultra-wide series display (34UC97).

When it sleeps, I have no audio.

How can I prevent this to happen. I usually listen to music all-day, yet no need to prevent the monitor from sleeping(don't need the screen).

I think there should be some screen modes or configuration helping on this.

LG 34UC97

Windows 10,

MediaMonkey