Unset an env override?

[Kwan Lowe]

Hello all:
  Apologies in advance if this is the wrong place to post this query.
I am very new to Flatpak and still finding out how to use it.

Recently I pulled in the Gnu Octave Flatpak to Linux Mint and RHEL8
systems. To get it to work I had to add a couple environment
variables. After documenting, I needed to delete the mistakes I made.
Short of drilling into ~/.local/share/flatpak/overrides/<appname> and
editing the override files, is there  a way to delete variables form
the Flatpak command line?