A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data
This is another one where Apple has muddied the waters. In order to use the Spacebar for that purpose you need to first change the setting in > System Preferences- Keyboard> Shortcuts. Select the option at the bottom of the pane for All Controls. [Note that this may adversely affect how things work in other dialog windows but at least you can use the Control+F7 keyboard shortcut to toggle the option rather than having to revisit the Preferences pane.]