When multiple objects are selected, how do you deselect just one of them?
Shift-click the object you want to deselect
Press Command+Shift+A (Mac) or Ctrl+Shift+A (Windows) and click the object you want to deselect.
Use the Lasso tool to deselect the unwanted object.
Hold down the Option (Mac) or Alt (Windows) key and click the object you want to deselect.