Config for MX Master 3 using https://github.com/PixlOne/logiops

logid.cfg

devices: ({
  name: "Wireless Mouse MX Master 3";

  // A lower threshold number makes the wheel switch to free-spin mode
  // quicker when scrolling fast.
  smartshift: { on: true; threshold: 50; };

  hiresscroll: {
    hires: false;
    invert: false;
    target: true;
    up: {
        mode: "Axis";
        axis: "REL_WHEEL";
        axis_multiplier: 1;
    },
    down: {
        mode: "Axis";
        axis: "REL_WHEEL";
        axis_multiplier: -1;
    }
  };



  // Higher numbers make the mouse more sensitive (cursor moves faster),
  // 4000 max for MX Master 3.
  dpi: 1500;

  buttons: (

    // Make thumb button 10.
    { cid: 0xc3; action = { type: "Keypress"; keys: ["BTN_FORWARD"]; }; },

    // Make top button 11.
    { cid: 0xc4; action = { type: "Keypress"; keys: ["BTN_BACK"];    }; }

  );
});