Press "enter." Or, probably, control-shift-A, or use the "Select>Deselect" menu item.
The "inference engine," that is, the thing that draws the little blue lines showing geometric relationships, will keep working unless you turn it off at "View>Smart Guides"
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The "inference engine," that is, the thing that draws the little blue lines showing geometric relationships, will keep working unless you turn it off at "View>Smart Guides"