How close articles? – Wikibot 2 — A Wikipedia Articles Reader Review

I've enjoyed Wikibot for a couple of years. But in v2.0.2 I can't see how to close an article when multiple articles are open. There used to be an 'X' in the upper right of an article window but not any longer. Any advice? I've emailed the developer several times but have never received a response.
Review by Rick7072 on Wikibot 2 — A Wikipedia Articles Reader.