Multi boot with encrypted OS

[Seabass]

I have a TB storage drive that Won’t get filled.
It is also the only drive in the computer.
So I’d like to partition the drive with multiple different operating systems with different purposes.
However, I’d also like each OS to be encrypted, do nothing that gets on one system gets into another, and so nobody has easy access if the computer is stolen.

As far as I’m aware, disk encryption requires presetting which partition is the root partition, so does anyone know if it is possible to have multiple operating systems on a computer and have each be encrypted?
Or am I required to keep them unencrypted if I want multiple operating systems?
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