trying to optimize some shapes…tried selecting all the shapes that are ungrouped and also tried just selecting 1 shape. as you can see in the screen shots it appears to work immediately
The issue I see is that your file already contains curves, and the current optimizer only works on line primitives - I don’t have curve smoother yet, but that’s coming.
Optimize Selected Shapes will only operate on parts of a path that are line segments, not splines / curves.
You could make it work by using Edit > ‘Convert to Cut’ to make a copy of your shape that is converted from curves to line segments, and then run the optimizer on the new copy.