Just a re-cap for anyone having this trouble.
I went on a merry chase through the code because the manual said that it couldn't be done through the control panel...but, it can;
Ref: ZenCart Manual pg 245 I believe I misread this as it states the center column can not be turned off. It does not explain that by turning off the right or left column it will expand to fill the space so need not be altered through the code.
however, i must have had two tabs opened in IE to the Admin and changed one setting on one and one on the other so that they knocked each other back to the default.
To do the trick, simply changing the right or left column width to "0" in
admin > config > layout settings > Column Right Status - Global > set to "0"
admin > config > layout settings > Column Width - Right> set to "0"