Clicking this exposes several Blueprint class settings in the Details panel. Most of these properties are general Blueprint class settings. However the following settings are specific to Animation Blueprints. Target Skeleton: Specifies the Skeleton Asset to use for this Animation Blueprint. Use Multi Threaded Animation Update: Enables the Animation Blueprint to update its native update, blend tree, montages, and asset players on a worker thread. The compiler will attempt to pick up any issues that may occur with the threaded update. Warn About Blueprint Usage: Enabling this causes warnings to occur whenever a call into the Blueprint is made from the AnimGraph. This can help locate optimizations that need to be made.