Have you ever thought it strange that you add elements to your site from the left side of the Designer, but Symbols from the right side? Well, we have. We think it makes more sense to group elements and Symbols together in the Add panel, so adding new components to your site all starts in the same place (and Interactions gets its own tab on the right).
Here's what the change looks like:
Creating and unlinking Symbols has also changed slightly — now you can right click on an element or hit CMD+SHIFT+A (CTRL+SHIFT+A on Windows) to create a new symbol...
...and right click on a Symbol on the canvas or hit CMD+SHIFT+A (CTRL+SHIFT+A on Windows) to unlink it.