I've been trying to connect my iPad Pro with my Macbook air, but it hasn't been working. I've heard that the Sidecar works with 2018 and later Macbook airs. I've tried most solutions that were online and it's still not connecting.
iPad Pro, iPadOS 14
See especially “Additional requirements” under “Sidecar system requirements” here.
Use your iPad as a second display for your Mac with Sidecar - Apple Support
See especially “Additional requirements” under “Sidecar system requirements” here.
Use your iPad as a second display for your Mac with Sidecar - Apple Support
iPad Pro 12.9 2021 Sidecar not working with 2018 Macbook air
