Are you referring to the Up-Arrow that pops up to shift? I haven't tried, but I believe that all you need to do is turn OFF the ECO. Near as I can tell on my 2013 Base, that Shift Indicator is ALL that ECO does on the MT Base.
On my 2013, the button (on the dash to RH of steering wheel)that allows me to toggle between ODO, Trip A, Trip B, AVE MPG and ECO. On THAT screen, it says/displays: "ECO ON". I THINK that to change it, I just hold the button IN until it changes to "ECO OFF".