Along with the new compact tab bar, Monterey added Tab Groups. Tab groups are a nifty way you can organize your tabs in a way that works best for you. You can switch between them with ease, and you can access your tab groups anywhere by syncing them to your other apple devices. This feature is fantastic for both professional and personal accessibility.
How to create Tab Groups
Click the Tab Group icon on the upper lefthand side of the browser.
An untitled new group will appear on the lefthand bar, you can rename it.
You can make multiple groups by repeating the process.