The Export Content option is accessed by selecting Tools/Export Content from the main menu. This option copies the content of your project to your computer's clipboard. The content is in a "flattened" format, suitable for pasting into an Excel spreadsheet.
By default, the entire project content is exported. If however the export is performed from a filtered view of the project, only the content that matches the filter is exported.
To access the result, open Excel, click on the cell you want to use as the upper left corner for your data, then perform a paste using Excel's menu or by pressing Ctrl-V. The active spreadsheet will fill with the content.