How do I customize the middle button on my M240 mouse?
Download and install the Logi Options+ app from logi.com/optionsplus, then once installed click on your mouse image in the app. On the left side of the window, click Buttons, then click on the middle button and select the function you want from the options on the right side of the screen. (Page 7)
From the official Logitech M240 Silent Bluetooth Mouse manual, page 7
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