Hi, Allen
Although EN pin is pulled up to VIN and VB through 100kohm, there is clamping circuit internally. Internal clamp circuit will clamp EN voltage down to around 5V if sink current is lower than 1mA. So, the actual EN voltage on EVB will be lower than 5V.
During your application, I recommend you pull up EN to a voltage lower than 6.5V through a pull-up resistor.