Change how email accounts display?

Change how email accounts display?

At the bottom of the column on the left, under the "compose" button, two email accts display, and then there is a "more" button to select additional accts if you are fortunate enough to manage way too many email addresses. Is there any way to change the number of accts that display by default. I would like all my emails to show, One less button to click . . . 

Thanks

Tim