To configure the buttons on a Logitech MX Master 3S (and presumably others in the Master range) without any extra app:
- System Settings -> Desktop & Dock -> scroll all the way to the bottom -> Shortcuts...
Button mapping compared to Logitech documentation:
| Logitech button name | Mac button number |
|---|---|
| Wheel press | Button 3 |
| Back button | Button 4 |
| Forward button | Button 5 |
| Gesture button (thumb) | Button 6 |