Can someone please explain VA companion voucher?

[Sue]

Ok, our flights to and from LAX have been cancelled but we do need to rebook for next year.
On Our WhatsApp chat, we cannot rebook as it is more than 331 days away. We can have a voucher or refund.
We have been told that we get a companion voucher if we opt for a voucher but even after asking for an explanation and looking on the VA website at the “simplification” - we don’t understand it?

We had four seats booked all Upper for this trip. So how can we upgrade a companion when we are all in the same cabin anyway? OR - does the companion voucher cover a different trip?
(We are continually checking prices for next year and it’s roughly equivalent to what we have paid, so thinking the voucher would cover it).

Thanks for any help