Shift-F3 is supposed to do the same thing on a Mac, without the need for a macro. See:
https://support.office.com/en-us/art...1-a6e3e1284b25
If that's not happening for you. you may have a faulty Office installation, or some other process may have taken over the Shift-F3 shortcut. You should check out what that shortcut is assigned to and, if incorrect or unassigned, correct it.