By default, the minimum length is 12 and the strength meter will show a strength of 1 if not met. Notice the bar won’t change from red until the minimum is met
Use the minLength prop to adjust.

The meter also response to averageThreshold and strongTreshold props. averageThresold defaults to 2, and strongThreshold defaults to 3.
This means that the bar will turn yellow when the strength of the passphrase is calculated to be 2 on a 0-4 scale, and green when 3.

Adjust these props to tune the sensitivity of the bar.
Note: minimum length trumps strength and will set the bar to a red color, despite whatever strength is calculated.