You can find the general settings by clicking on the gear icon on the desktop interface and clicking on the General tab.

This is what the general settings looks like:

General settings include:

• Camera Movement Speed - The speed that the camera should move in meters/second.
• Camera Easing - Whether to apply easing to the camera movements.
• Shadows - Enables or disables rendering shadows. Note: Shadows can have a substantial performance impact and may cause frame rate issues on lower end machines or be unavailable on lower end VR devices.
• Shadow Resolution - The resolution quality of the shadows when they're enabled.
• User Interface Sounds - Whether to play user interface sounds or not. Note: Sounds will automatically be silenced while recording, but may not be silenced automatically if you're recording your screen using third party software.
• Desktop Mirror - Enables or disables the desktop mirror prop.

Next: Microphone settings