CloudLinux and CageFS is available with CyberPanel v.1.8.6, but before using any of its features, you need to convert your operating system to CloudLinux OS. Use commands below to convert your server to CloudLinux OS.
If you have CloudLinux activation key:
wget https://repo.cloudlinux.com/cloudlinux/sources/cln/cldeploy sh cldeploy -k <activation_key> reboot
Or if you have IP based license
wget https://repo.cloudlinux.com/cloudlinux/sources/cln/cldeploy sh cldeploy -i reboot
This will successfully convert your OS to CloudLinux, and you can then use CloudLinux related features within CyberPanel including CageFS.