• How to use your cell phone as a touchpad on Samsung DeX?
Open the notifications panel.
Press “use phone as touchpad”.
Navigate using the touchpad with your fingers
• Disable routing audio usb:
First, you will need to activate the developer mode on your phone:
To enable developer mode on a Samsung phone, follow these steps:
Go to your phone’s settings
Press “About Phone”.
Press “Version number” repeatedly until the message “You are now a developer” is displayed
Go back to the main settings and go to “Developer Options”.
Activate the “Developer Mode” option
To disable USB audio routing on a Samsung phone, follow these steps:
Go to your phone’s settings
Go to “Sounds and Vibration
Select “Audio Out”.
Disable the “USB Audio Out” option
Note: The steps may vary slightly depending on your Android operating system version.