Developers will be able to position content on either side of the contentious notch on the new Apple MacBook Pros. macOS Monterey will also offer a compatibility mode that can either be provided for by developers or enabled manually the Get Info panel in Finder, which reduces the display area via a black bar hiding the notch area.
https://www.notebookcheck.net/Apple-MacBook-Pro-Developers-can-position-their-app-menus-on-either-side-of-the-notch-or-let-macOS-Monterey-hide-the-notch-in-compatibility-mode.573934.0.html