Hello
@Grzemar The sound balance lets you adjust the left-right balance audio settings for those with hearing impairments or those who frequently listen with only one headphone.
Can you show me a screeshot of what your audio settings look like and are you able to toggle the mono audio to off?
Also, if you're having issues with audio wizard, Please try to reset by following these instructions:
Settings>Apps & notifications>App info>3 dots on the top row>Reset app preferences