If double-clicking for ad hoc operations is enabled, you can zoom in to the default zoom level and zoom out by double-clicking in a member cell.
To enable double-clicking for zooming:
From the Smart View ribbon, select Options, and then select Advanced in the left panel.
Under Mode, select Double-click for Operations.
If you do not select Double-click for Operations, then double-clicking retains Excel functionality and puts the cell into edit mode.
Note:
In blank worksheets, double-clicking the first time retrieves the default grid and thereafter zooms in or out.
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