The contents of each display editor are displayed in data grids, which typically have three or more columns of data within the grid. A few are two column name-value pair data grids, such as the Details editor. The data in these grids is not editable and merely reflects the details about the object or structure selected. There are two exceptions. The first exception is the Data editor included with the set of display editors for certain objects, such as tables and views. The Data editor displays the instance data for a table and, depending on the object, this data can be edited and the changes can be committed to the database. The second exception is the Code editor for PL/SQL objects, where you are placed into a PL/SQL editor when you select the object.
Data grids throughout SQL Developer have context menus on the column's headings and the data grid itself. You can control the layout and what data is displayed by using these two context menus. For the remaining...