According to these questions, the Area Selection feature has been disabled:
I consider this feature as core feature for Lucid Chart. In fact this was one of the features that convinced us to buy the licence for the product. It allows us to make live links to the charts and place those links in the documentation pages.
We will strongly consider moving to another tool, if this feature is not added back.
Is there any possibility that this feature will be turned back on? And when would that be?