Why doesn't 2D Arrows follow move with the model?

Arrows are parts of the 2D annotations, one thing to keep in mind is that 2D annotations are generally used to annotate on specific camera view to show point of interest. The scale of the arrow is relative to the Viewer windows size, and the location is fixed to the relative location of the whole Viewer windows.

However, if you wish to have the 2D annotations to follow a specific location on a part in the model, when you create the arrow, start from the point of interest you want the arrow to follow,  click and drag to create an associated annotation. This way, the annotation will follow the point of interest like an callout

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