A folder sheet appears when a folder is selected in the Analysis Navigator. It lists the name of the current folder in the upper left corner, followed by all of the sheets and subfolders contained in the current folder, plus all of the sheets contained in each subfolder.
You can access any sheet or subfolder by clicking on its name in the folder sheet. This provides a quick and easy way to "drill down" from an upper-level folder to a sheet in one of its subfolders.
Example: You can go directly from the Financials folder to the Historic Income Statement by clicking on "Historic Income Statement" in the Financials folder sheet.