The higher DPI does come in use when using multi-monitor setups. I ended up using the mouse at 1,000 DPI which felt sufficiently accurate for regular work tasks and while editing images. Logitech has also cranked up the DPI from 4,000 on the MX Master 3 to 8,000 on the MX Master 3S. You can also copy and paste files (transfer time varies by file size) between two devices (and platforms), but you cannot drag and drop. It all works naturally, similar to what’s now possible when using macOS’s Universal Control feature, just that instead of being limited to one platform, Logitech’s solution works across operating systems. From there on, you can simply move your mouse pointer to the edge of your main display to start controlling the system sitting next to it.
All that is needed is for the software to be installed on all the devices and for all of them to be connected to the same Wi-Fi network. The Logi Options+ app, like before, also enables the Flow feature that allows the Logitech MX Master 3S to work with two to three devices simultaneously. It all works seamlessly and flawlessly no matter how many layers or customisations you add. The thumb scroll wheel which is normally used for side-scrolling in apps, will allow you to switch between tabs when Safari is open and will go back to its default setting when you use it anywhere else. For example, the side buttons can be used to switch between desktops on macOS, but when Safari is open, the same buttons can be used to move back and forth between pages. There are predefined customisations which are basically preselected options made by Logitech, or you can simply customise things to your liking.