[Evolution] trying to set "org.gnome.evolution.mail browser-close-on-delete-or-junk" to "true"

[Antony Steele <antony c steele gmail com>]

Hi, I found a previous post and advice to use dconf-editor to set 
"org.gnome.evolution.mail browser-close-on-delete-or-junk" to "true"

But, I can not find org.gnome.evolution.mail, so can not also find "browser-close-on-delete-or-junk".

I can use dconf-editor to see org.gnome.evolution and org.gnome.evolution-data-server, but no .mail can be found.

I am running Evolution 3.40.0 on Ubuntu 20.04.2 LTS

thanks for any guidance,

Antony.