Which feature allows you to repeat an effect across multiple frames or layers with a single application?

The feature that allows you to repeat an effect across multiple frames or layers with a single application is Animation Presets. Animation Presets save a specific combination of keyframes and effects so that you can easily apply them to layers without needing to recreate the same settings manually each time. This is particularly useful for maintaining consistency across multiple elements or frames in a project.

Using Animation Presets, you can apply complex animations to multiple layers quickly, ensuring that the same look and feel are preserved. This streamlines the workflow, as it removes the need to keyframe elements individually when a pre-defined animation is sufficient.

Effect Presets are similar but generally pertain specifically to the effects applied to layers rather than animated movements or transitions. Layer Styles apply visual styles like shadows and glows but do not involve animation sequences. Keyframe Assistant is a tool used for managing and refining the timing and interpolation of keyframes, rather than applying effects across multiple items. Thus, Animation Presets stand out as the most efficient choice for applying repeated effects in a consistent manner.