Using The New Sprite Packer with UIs

Pre-Unity 2017.1 to make optimized UIs I’d set the packing tag on our UI sprites and the Sprite Packer would automatically build the atlas when the game was played. Now that Sprite Packer seems to be marked as legacy and as far as I can tell in Unity 2017.1 this all happens behind the scene.

Trouble is I’d like to see the atlases that are being generated (so I can know how well various UI elements are being packed) and when I do a build the console spits out the uncompressed texture sizes and I’m seeing each individual sprite UI when I’d prefer to see the sizes of the atlases generated.

Is there something I’m missing about the new Sprite Packing setup? Thanks in advance.