How do I use the article search feature

Go to a section in your feedly (the all page, a category page or a feed page) and you will see at the top right a new search box. Enter the keyword you want to search for and press enter to get the list of article in that section (ie. category or site) which match the entered search term.

Also check out the full feature list here:
https://cloud.feedly.com/#upgraded

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