This will open the Screenshot Toolbar at the bottom of your screen.
Then select either the Record Entire Screen or Record Selected Portion buttons in the pop-up toolbar that appears at the bottom of your screen. To record your screen on a Mac, press the Command + Shift + 5 keys on your keyboard. How to Screen Record with Keyboard Shortcuts
Here’s how to record your entire screen or just a portion of it on a Mac, no matter how old your computer is. You can even record audio, show your mouse clicks, and more. Whether you want to save a YouTube video you’re watching, or you want to show someone a problem you are having on your computer, it’s easy to take a video of your screen on a Mac.