Currently my org-mode agenda is showing in tabbar as "Org-Agenda 21 days
Diary Ddl Habit", how can I get it just showing as 'Org-Agenda' please?

Thanks
Sharon.
-- 
A taste of linux = http://www.sharons.org.uk
TGmeds = http://www.tgmeds.org.uk
Debian 8.3, fluxbox 1.3.7, emacs 25.0.92