I used to have DisplayFusion to customise just how I liked, so I don’t know exactly when a lot of this stuff changed - could even have been Windows 10 - but things like support for different backgrounds on each monitor, ability to indicate the relative heights your monitors are set at so the mouse flows smoothly between them (useful if you have a proper screen and a laptop one for example), mouse will scroll the window where the cursor is currently located rather than the active window as default, easier snap layouts to simulate a dual monitor setup on one…generally it just works exactly how I would expect out of the box.