Now you can save elements and any non-section designs to your assets and libraries and reuse them across all the sites in your account.
Simply right-click an element or a designed composition and select to save it to your assets or a library.
All saved designs will appear in the add panel, under the 'Design Assets' category.
There are some elements that for now can't be saved (as well as any compositions that include them):
Widgets and TPAs (Stores elements, Forms, etc.)