Swipe down from the top of your screen with two fingers to open the full panel. Look for the Screen Recorder icon (a video camera icon).
Swipe down twice from the top of your screen to fully open the panel. Tap the three-dot menu icon in the top right corner. Select from the dropdown menu. Locate the Screen recorder icon in the top available pool.
If your Samsung device runs and cannot support the official Samsung plugin, you will need to download a high-quality alternative from the Google Play Store.
Note: The floating toolbar itself will not appear in your final saved video file. Customising Your Video Settings