How do I pair this mouse with a Windows computer using Bluetooth?
Make sure your Windows machine has Bluetooth Low Energy enabled, go to Settings > Devices > Add Bluetooth or other devices, then select 'Bluetooth'. The MX Master 3S will appear in the list of available devices; click on it and follow the prompts to complete pairing. (Page 2)
From the official Logitech MX Master 3S Wireless Mouse manual, page 2
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