Why are these using swap when I have plenty of free ram?

[Colin Law]

On Fri, 8 Nov 2019 at 21:44, Chris <chris.pollock1948 at gmail.com> wrote:
>
> The below processes are using swap for some reason:

If you have a transient situation with a shortage of RAM then little
used stuff will be moved out to swap. When the transient situation is
over there may be plenty of RAM available but if the stuff in swap is
not used again then it will be left there.  There is no reason to go
to the effort of moving it back.

Colin