Texas Instruments TI-73 Manual Book page 22

When you select percent values (in the settings) for the
WINDOW
upper or lower indicator, Fraction Line uses 100% to equal 1 at
all times. All values greater than 1 will be over 100%. must
Min
always be ‚ 0 (zero). If you select
and enter a negative or
% Min
, you will receive a error. Select to
Max WINDOW RANGE 1:Reset
reset the settings to an indicator value other than
WINDOW
percent. Select to go to the error and enter a new value.
2:Goto
Number Line/Fraction Line for the TI-73 Page 22