Bluetooth headphones bad sound quality fix

On desktop press "Win+R", enter the command "devmgmt.msc" and click "OK".
In the window that opens, select "Sound, video and game controllers", find your headphones with the signature "Hands-Free", right-click on it and select "Disable device". Restart your computer.

Unfortunately, because of this, you will no longer be able to see the battery level of your headphones in Windows.

Please note that you only need to turn off the hands-free device, you do not need to turn off your main headphone device. Also, do not confuse that it is necessary to disable it in the "Sound, video and game controllers" item, disabling the device in the "Audio inputs and outputs" item will not lead to a result.

A little theory about what we did:
Hands-Free or HFP is a Bluetooth profile that allows you to communicate through the microphone built into your headphones. Unfortunately, this profile only supports mono audio, at a low bitrate, so it's not designed for simultaneous gaming and chatting - the quality is too poor, so gamers usually use either a wired headset or a separate desktop microphone.For some reason, in Windows 11, this profile is automatically enabled in some games that check for a microphone, even if the hands-free device is not set as the primary device or is disabled in mmsys.cpl. This behavior was not in Windows 10, so let's hope that Microsoft someday fix this problem, but for now, this is the only way to solve it.