[Geary] How to change account pane width?

[Grant Edwards <grant b edwards gmail com>]

How does one change with width of the account pane?

It's so narrow that all I can see is the first letter of each Gmail
"label" folder name:

    http://www.panix.com/~grante/geary-pane-narrow.png

Trying to drag the border between the account pane and the message
pane doesn't seem to do anything.

    $ flatpak  run org.gnome.Geary --version
    geary 0.12.4

--
Grant Edwards
grant b edwards gmail com