I've done something stupid to my Linux Skype configuration. Only my online contacts are shown—it's as if my offline contacts don't exist. This is a problem when I'm trying to figure out if someone is a contact already or not. The screen shot below shows the story. How can I make my offline contacts appear on this screen?
N.B. Answers for the Windows interface are not helpful—the Linux interface is completely different.
P.S. Search has been unhelpful, as the results are swamped by questions about people who wish to appear offline when they're not.