To work directly with the camera in Adobe After Effects, changing the "3D view" popup to display the camera and other 3D layers is essential. This option selects a specific 3D view in the composition that allows you to work with 3D elements effectively. By utilizing this feature, you can set the composition to show different angles or perspectives, enabling a more intuitive and comprehensive manipulation of the camera and 3D layers within the scene.
Working directly with the camera in a 3D space requires the program to know how to display the 3D elements in the composition window. The "3D view" popup facilitates this by allowing you to select predefined views or create custom ones, providing a clear vantage point from which you can adjust the camera's position, orientation, and movement relative to other elements in your scene.
Options that involve changing a layer’s scale, adjusting the frame rate, or modifying color settings are unrelated to camera manipulation and focus on different aspects of composition management. These changes might affect the visual output or playback characteristics of your project, but they do not influence how you interact with the camera in a 3D space.