Logitech MX Master 3S Manual page 61

Make sure Bluetooth is turned ON on your computer
Click Start, then select Settings > Devices > Bluetooth & other devices. Make sure Bluetooth is
turned ON. If you're using a laptop with a Bluetooth switch, make sure the switch is turned on.
Restart Bluetooth on your computer
1. Navigate to the Bluetooth settings pane:
Click Start > Settings > Devices > Bluetooth & other devices.
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2. Click on the Bluetooth switch to turn Bluetooth Off.
MX Master 3S FAQs 61