The center of the screen shows the detail of the Solr core selected, such as statistics,
summary report, and so on.
Core-specific details
On the left-side of the Sole Admin screen, you will see Core Selector. Clicking on the menu displays a list of Solr cores hosted on this Solr node, with a search box that can be used to find a specific core by name.
This includes a sub-navigation for the option or text or graphical representation of the requested data.
See Solr Admin UI - left panel to know more about each screen.