Find ungrouped contacts on MacOS

Step 1: Create a new "*Smart Group*" by either choosing "File" and "+New Smart Group,+" or press and hold the "Option" key and the click on the plus sign on the bottom left corner.

Step 2: Name your new "*Smart Group.*"

Step 3: Under "Contains cards which match the following:" choose "Card" and then "*Is not member of*" and then "*any group.*"

Step 3: Click "OK."

Then you can just go to that smart group to view the ungrouped contacts.