I've been puzzling over this for several weeks now, how can I get the
TOC of a document, written in org-mode and exported as latex and then
built into a PDF, have just one column of its TOC, instead of what seems
to be its default of 2 columns, please?

Thanks
Sharon.
-- 
A taste of linux = http://www.sharons.org.uk
DrugFacts = https://www.drugfacts.org.uk
Debian 9.4, fluxbox 1.3.7, emacs 25.3.3, org 9.1.13