Airplay icon not showing - can't use sidecar
I'm trying to use sidecar on my MacBook Air 2018 with iPad Pro 4th generation.
I don't see an airplay icon on the menu bar of my MacBook and I've checked displays and the 'show mirroring options in the menu bar when available' is on but I can't turn on airplay display and don't see any icons. I also don't have a sidecar option in my system preferences.
I've connected my MacBook with my iPad by cable and made sure they are both connected to the same wifi and iCloud accounts with their bluetooth on but nothing's happening.
Is there some other way I can turn on airplay or use sidecar?