When turned on, Microsoft Edge will connect local browsing data from this profile with the rest of Windows. Turning this feature on will help you find information from your history, favorites, top sites and recent tabs more easily using features such as Windows search box. If you turn off this feature Microsoft Edge will remove the data shared with Windows on the device and stop sharing any new browsing data from this profile.Learn more
I'm on the latest Windows 10 insider Dev build and latest Edge insider canary, so far I couldn't see any sign of this feature working, it's very new, just added to Edge canary. so eager to find out more about this. I personally would love to see Edge history appear in Windows 10 timeline, just like Edge legacy's did.