There, you see me open the widget area with a link twice, closing it each time with the ‘close’ button inside the sidebar. The third time I open it, I close it by clicking outside the sidebar, and it closes itself instantaneously (not transitioning out). Open it again, and it instantly closes itself, and proceeds to do this sort of rubber-banding thing over and over.
More info: https://wordpress.org/support/topic/compatibility-with-enfold-theme-3/