Modify the control limits for T² Chart

Stat > Control Charts > Multivariate Charts > > T² Options > Limits

Display additional confidence limits at

In These percents, enter one or more values to display additional confidence limit lines on your control chart.

Use proportion values (between 0 and 1) or percent values (between 1 and 100).

Place bounds on confidence limits

In Upper confidence limit bound, you can enter a bound for the upper confidence limit. The value must be greater than 0. If the calculated upper confidence limit is greater than the upper bound, Minitab draws a horizontal line labeled UB at the upper bound instead.