sidecar connection

Sidecar is for iPads only. However, you can connect an iMac using Target Display Mode, depending on the model of iMac.

https://medium.com/macoclock/undust-your-imac-with-target-display-mode-61bfb182b6b9

AudreyB96 wrote:

Can sidecar be used to connect an iMac with a MacBook pro or is it just for Macbook to iPad only? And if it cant can an iMac and MacBook pro be connected so that you can have a second screen?

Compatible iPad only...

Under no condition has apple ever supported MBP as an external monitor.

Use your iPad as a second display for your Mac with Sidecar ...