I have a Master 2S. The mouse wheel is middle-click and there's a separate button below this to change the wheel mode.
^ this.
All MX masters have a click / free scroll button below the wheel. The wheel click can be assigned as a button in the Logi options app.
@Soul started
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I have a Master 2S. The mouse wheel is middle-click and there's a separate button below this to change the wheel mode.