What can you learn by asking users to draw an interface from memory? A lot actually!
It helps you assess the learnability of an interface, understand user’s mental models (what do people draw first, what do they draw larger aka more important, what words do they use to describe things) and identify potential usability issues.

Simple recall testing for B2B UX (11min) By Olesia Vdovenko https://uxdesign.cc/simple-recall-testing-for-b2b-ux-134e18330da9