While users and developers come to terms with the fact that the last-minute notch rumor for the new MacBook Pros was true, Apple has released new Human Interface Guidelines explaining how developers can make best use of the extended screen areas around the camera housing if they think their app would benefit from it.
According to the new documentation, the fullscreen mode in macOS Monterey automatically accounts for the camera housing by placing a black bar across the top of the screen to hide the notch and prevent app content from being placed there.
However, macOS also includes a new app “compatibility mode” for MacBooks that include a notched camera housing in the screen bezel. Essentially, the new mode prevents apps from locating content in the notch area when in fullscreen mode, while also allowing them to make use of the screen areas on either side.
Read more at MacRumors.com