what do i need to allow my macbook pro to run my imac as a second monitor
I have a Macbook Pro 2020 model I want to use my imac 21.5 inch 2017 as a second monitor what cable(s) connectors do I need to solve this? I was advised by an Apple technician a thunderbolt 3 cable would suffice however it does not, unless I need some other sort of connector. Please can someone help