I'm cant set org-agenda to start a week on other day that isn't sunday.
As @ebpa comment set variable set custom variable via: M-x customize-variable
and then org-agenda-start-on-weekday
to set the day.
Also you have other methods.
In your emacs startup file -- maybe ~/.emacs -- put
(setq org-agenda-start-on-weekday 1)
and this will set it to Monday. It will become active the next time you start emacs. If you want to activate it immediately put the cursor behind the trailing ')' and type C-x C-e -- evaluate preceding S-expression.
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1
org-agenda-start-on-weekday
looks appropriate – ebpa Nov 25 '16 at 22:26M-x customize-variable [return] org-agenda-start-on-weekday
or put(setq org-agenda-start-on-weekday 6) ;; saturday
in your init.el – ebpa Nov 25 '16 at 22:41