1. A method of displaying related content on a user interface, the method comprising: analyzing, by one or more processors, an initial electronic document to identify a mention in the initial electronic document; generating, by one or more processors, a mention descriptor of the mention in the initial electronic document according to a context of the initial electronic document; appending, by one or more processors, the mention descriptor to the initial electronic document; mapping, by one or more processors, the mention descriptor from the initial electronic document to a disambiguation identifier from a knowledge base that contains a version of the mention, wherein the disambiguation identifier is an entity within the knowledge base; associating, by one or more processors, the disambiguation identifier with the initial electronic document; locating, by one or more processors, the disambiguation identifier on an entity metadata visualization panel, wherein the disambiguation identifier was appended to the entity metadata visualization panel after mapping the entity metadata visualization panel to the disambiguation identifier from the knowledge base; retrieving, by one or more processors, the entity metadata visualization panel; and displaying, on the user interface, the entity metadata visualization panel as related content that is related to the mention in the initial electronic document.