If your Mac and iPhone are new enough, you might be able to set up your Mac as an AirPlay Receiver, and use AirPlay to Mac to display content on your iPhone on your Mac's screen.
Use Continuity to work across Apple devices - Apple Support
But if your iPhone is far away from your Mac, that's probably not what you're looking for. Note that you can synchronize many things (Calendars, Contacts, Notes, Photos, iCloud Drive files) between your Mac and your iPhone using iCloud. Also, you may be able to use your Mac to take calls that come in on your iPhone.