Accessibility audio settings on Apple Watch
If you prefer to hear a combined left+right audio signal out of both audio channels on speakers or headphones connected to your Apple Watch, turn on Mono Audio. You can also adjust the left-right balance of your Apple Watch audio, whether stereo or mono. And you can change AirPods settings to be more accessible.
Change mono audio and balance settings
Open the Settings app on your Apple Watch, tap Accessibility, then, under Hearing, do any of the following:
Switch from stereo to mono audio: Turn on Mono Audio.
Adjust the audio balance: Drag the slider below Mono Audio.
You can also open the Apple Watch app on your iPhone, tap My Watch, tap Accessibility, then turn on Mono Audio and adjust the audio balance.
Change AirPods settings
You can change press speed and press-and-hold duration settings for the AirPods you use with your Apple Watch. You can also turn on noise cancellation on AirPods Pro for when you have one of your AirPods in only one ear.
Open the Settings app on your Apple Watch.
Go to Accessibility > AirPods, then choose settings.
You can also open the Apple Watch app on your iPhone, tap My Watch, then go to Accessibility > AirPods.