All Samsung devices have had Screen Recording capabilities, but the feature was hidden and had to be accessed via the Game Tools. It is super easy to miss, and a lot of people invariably ended up relying on third-party alternatives. The problem wasn't the lack of availability, just the lack of visibility. The Galaxy Note 10 series, on the other hand, makes it a lot easier for users to record their screen. Users can now start recording their screens right from the quick toggle menu in the notification shade.
If you still can't see it, tap the three dots on the top right corner, select 'button order' and drag 'screen recorder' into the grid. You can further customize the Screen Recorder by heading over to the Settings app. From there, head over to Advanced features.
Look for an option called Screenshots and screen recorder, and then tap Screen recorder settings.
The Screen recorder settings menu will allow you to record your screen with no sound or with media sounds, i.e., audio coming from apps running on your phone. Similarly, you can choose to record both media sounds as well as audio picked up by the microphone. Beyond audio settings, you’re also given three options for the video quality of your screen recordings, as well as a slider for adjusting the size of your self-portrait, which we'll explore later.
Do note that the Galaxy Note 10's Screen Recorder is still subject to the same rules as any other app on the market. Several apps such as Netflix will flat out refuse to work if any screen capturing service is found to be running. There are ways around it, but I'd not recommend those (not officially anyway) One of the major grouse many people had with Stock Android was its lack of screen recording capabilities and it's good to see Samsung going the extra mile to deliver such a basic function. Android 10 is rumored to come with an in-built Screen Recorder too and we'll know more about that once the OS drops.