We’re in the process of updating the documentation for Zotero 5.0. Some documentation may be outdated in the meantime. Thanks for your understanding.
The Locate menu offers several ways to access files in your library and to look up items online. The menu can be opened by clicking the straight arrow button () at the top-left of the right-hand column of the Zotero pane.
Which menu entries are available depends on the type of items you have selected in the middle column. The possible options are:
If you select the Library Lookup option, Zotero will try to locate your items in an online library catalog, so you can track down a physical or online full-text copy of the resource. By default, Zotero uses the OpenURL service of WorldCat.org, but you can specify a different OpenURL resolver (e.g., the OpenURL resolver of your local university library) in the Advanced tab of the Zotero preferences.
The Manage Lookup Engines… option opens the Article Lookup Engine Manager window, which allows you to enable/disable, reset, or remove installed lookup engines. Additional lookup engines can be installed via the 'Add “… Lookup”' entry that appears in the Locate menu when visiting a webpage that specifies a lookup engine via OpenSearch.
To find a Lookup Engine for your local public library, visit: http://egh.github.io/zotero-lookup-engines. There are thousands of local public libraries listed there.