A new effect called Presenter Overlay will show the screen you want to share next to your own head, almost like a weather reporter standing in front of a weather map. You can also start screen sharing by clicking a dedicated button in the top-left corner of whichever app you're using (Apple says it will work within any video conferencing app). The company is bringing Reactions to video calls too (the same as what you'll find in the Messages app). With a hand gesture, you can trigger balloons, hearts, or confetti to pop up during your call. These features are only available on Macs powered by Apple's own processors (not Intel machines).

Speaking of, Apple Macs with M-series chipsets are privy to a new mode in the Screen Sharing app that lets you get responsive remote access to your MacBook when you're away from it. That includes high frame rates and low-latency audio, with support for up to two virtual displays and support for reference color.

Apple is adding more safety features to its preexisting private browsing feature in Safari (which keeps the browser from saving your history). Rather than closing your tabs when you step away, you'll be able to lock your private browsing windows whenever you walk away from the device. 

New in Safari is also the ability to separate the browser via profiles, meaning you can create one profile for work and another for your personal life. It'll separate your history, extensions, cookies, Tab Groups, and Favorites. It's easy to switch back and forth. 

You'll also be able to create web apps, which allow you to turn your favorite websites into an app-like experience that you can place in the dock. Instead of opening a browser window, these web apps will launch and act like a traditional macOS app when you click on it. You can get notifications from them, and even segment them in tools like Stage Manager.