It's easily available from the library menu on the side.You can search a single library, a group, all libraries. It is now called Filter and its kinda like the old search on steroids.

Gone are the unintuitive concepts of active library, non-active library, etc. Showing both the schematic symbol and the pattern in large easy to see form: Search of the libraries has been made much more prevalent and logical. While selecting components in the schematic phase is MUCH easier now. Instead of the older system which only had everything broken down by vendor name. There are now libraries of common parts such as headers, connectors, caps, etc. I seem to remember this at least partly occurring in 2.3.x versions, but the standard libraries themselves have been revised. You can still add/remove libraries manually via Library Setup if you so desire. This appears to allow them to automatically add all libraries created on the computer. Libraries are now broken into groups, separating the user libraries from the standard included ones. The library management system has finally been completely revised. More recently, they mentioned that a complete rewrite was in the works and it now appears to have gone live. Novarm has long admitted the system was broken and they weren't happy with it. You could work with it (mostly) but it wasn't pleasant or intuitive.

It has been no secret that it was one of the biggest letdowns in DipTrace. As much as I loved DipTrace, I HATED the LMS I hated it with a passion. what have they changed? First and foremost they updated the previously horrible library management system. This was discussed in the beta thread but I thought I would break it out here for more visability.

Diptrace arduino library