You can use the Shift key in combination with other spreadsheet shortcut keys to select multiple spreadsheet cells.
Example:
- To select an entire column from the current position down, select a cell and press Shift+Ctrl+¯.
- To select an entire row from the current cursor position to the right, select a cell and press Shift+Ctrl+®.
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To select all the items on the spreadsheet, click the topmost row header.