Both come with the highest level of tracking prevention and strict Bing SafeSearch. There are also 70 websites in the whitelist, though you have the option to add more. If your child goes to a site that’s not allowed, Microsoft Edge will put up a block page that asks them to get permission from an adult.
To turn off Kids Mode, you’ll have to re-enter your Windows or macOS password to turn it off. On Windows, it goes a step further by disabling a number of Windows keyboard shortcuts. The Verge says that the feature will be out on the Microsoft Edge browser today, but at the time of writing we don’t have access to it yet.