As a Mac user, I always use spacebar to preview files before open them, and I'd like to be able to do the same thing with symbols inside XD and preview them in a bigger window in order to have a better view of the small ones.
Jordan Soltman commented
When I am working with symbols that have small differences it's impossible to tell which is which with the small preview that is given. The only way is to pull them onto the canvas, delete them, etc until the correct one is found. It would be great to get a pop-out preview either with a keypress, or on hover.
I've attached a quick mockup of the idea.