Which function allows you to customize the motion blur in an animation?

The function that allows you to customize motion blur in an animation is the Motion Blur Settings. This feature provides various options for adjusting the intensity, quality, and other properties of motion blur applied to your layers, enhancing the realism of moving objects within your composition.

When you enable motion blur for layers and adjust the associated settings, you can fine-tune how the blur appears based on the speed of the motion or the direction in which the layer is moving. This customization is crucial in achieving a more dynamic and visually appealing animation that conforms to the expectations of real-world motion, where objects in motion appear blurred to the viewer.

Other areas like Layer Preferences, the Effects Control Panel, and Transform Options do not primarily focus on specifically customizing motion blur effects. Layer Preferences can control overall layer settings, the Effects Control Panel manages additional effects, and Transform Options pertain to the position, scale, and rotation of layers, but none provides specialized controls for motion blur like the Motion Blur Settings do.