#Select another tool
Select another tool
or to merely unselect the selected art...
#Unselect All
Unselect All
Command/Ctrl+Shift+A
Or Select > Deselect
Or just click anywhere else to deactivate the current selection.
The shortcut comes in very handy if you are zoomed in and there's really no "clear" area to click. But most often... I simply click a "blank" area in the document.
The shortcut also works in InDesign