document manager
When you open Numbers for iCloud, you see the document manager where you create, open, and manage spreadsheets stored on your iCloud Drive.
By default, the document manager shows recently opened or uploaded spreadsheets in the Numbers folder. Click Browse in the left sidebar to view all items in the folder, or to sort the contents by date, kind, name, or size. To search for a spreadsheet, press Command-F (on a Mac) or Control-F (on a Windows device).
To return to the document manager when a spreadsheet is open, click in the toolbar, then choose Go to My Spreadsheets.