Anybody know how to reset TI-BA II to six decimal places?

I’ve been using a TI BA II everyday for the past 8 months, and I’m afraid the battery may die come exam day. So I bought a new calculator (50% on sale!), but it is set to three decimal places. Anybody know how to set it to six decimal places? thanks yancey

2nd format (above the decimal point) 6 enter

gracias cpk