When Wi-Fi Direct (Simple AP) connection disabled, all computers and smart devices connected to the printer in Wi-Fi Direct (Simple AP) connection are disconnected. If you want to disconnect a specific device, disconnect from the device instead of the printer.
Tap 
on the home screen.
Select Wi-Fi Direct.
The Wi-Fi Direct information is displayed.
Tap Start Setup.
Tap 
.
Select Disable Wi-Fi Direct.
Tap the Disable the settings.
When a completion message is displayed, close the screen.
The screen automatically closes after a specific length of time.
Close the Network Connection Settings screen.