Toggle for display "All" vs "Unread Only".
For some journals (e.g. Open Access journals like eLife or the Frontiers journals), the number of articles per issue can get huge, and BrowZine appears to sort them alphabetically by title. This can make finding the unread articles (with a blue dot) time consuming. It would be easier if it were possible to toggle between displaying only unread articles vs all articles.
Hazen Babcock commented
This would also be really helpful for browsing Nature Communications. It can take several minutes of scrolling and waiting for page loads to reach the unread articles at the bottom of the page.