I installed without actively adding swap (other than as a partition during installation). Its in my fstab but doesn't appear to be enabled.

I searched a little without finding an obvious solution. Can anyone suggest how I should enable it now?

UUID=56921cf5-5562-4a9d-899c-0eba6f0e8cc2 none swap defaults 0 0
I did follow the suggestion I found here https://forum.obarun.org/viewtopic.php?id=1403
sudo 66-env -e vim boot@ system
and changed swap from !no to !yes then 
sudo 66-enable -t boot -F boot@ system
and restart but the result was:
~ > cat /proc/swaps
Filename                                Type            Size            Used            Priority
~ > sudo 66-intree  -g boot | rg swap
[sudo] password for john:
               ├─(down,Enabled,oneshot) mount-swap
Solved.

The UUID in fstab was incorrect. I must have manually added from an earlier distro's installation. Correcting it enabled the first two commands to take effect:
~ > swapon -s
Filename                                Type            Size            Used            Priority
/dev/sdb5                               partition       16382972        0               -2
~ >

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