How do I connect the M585/M590 Silent mouse via Bluetooth for the first time?
Download Logitech Options, click Add Devices, and select Add Bluetooth Device. Make sure your mouse is ON (or remove the pull tab), short press the Easy-Switch button to select your desired channel, then long press the Easy-Switch button to enter pairing mode. Finally, find your M585/M590 in the list of Bluetooth devices and connect. (Page 4)
From the official Logitech M585 M590 Silent Wireless Mouse manual, page 4
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