Anim Graph Debugging
Animated Model Instance

Use object picker on a toolstrip to debug specific actor from loaded scenes. If unset, the default in-built actor will be used.
Animation Playback Preview

Anim Graph editor displays the current playback position of the animations as a progress bar over the node. For state machines, the currently sampled states are highlighted with the gree outline.
Parameters Preview

Under properties panel select Preview tab to display current state of animated model parameters. Those can be modified to actively test Anim Graph witohut rebuilding the asset (when changing default parameter values).