Logitech MX Master Frequently Asked Questions Manual page 51

 +Customize desktop layout with Logitech Flow
You can customize the layout of your computers in Logitech Flow. Here's how:
1. Open Logitech Options and select the Flow tab.
2. Rearrange your computer setup to match your desktop layout by dragging the screens displayed
in the right panel and dropping them to the desired position.
NOTE: Logitech Flow supports two or three computers.
3. To switch how your mouse flows to the other screen, click on the blue screen and drag it to the
right until the white screen is on the left, as shown below.