HVBLDC_Sensored,How to control the acceleration of the motor, how to control the motor stop?

The software path I used:  D:\ti\controlSUITE\development_kits\HVMotorCtrl+PfcKit_v2.1\HVBLDC_Sensored

Hardware:DRV8303Evm Ver.C

I have confirmed that the procedure has been correctly modified.I set the program to run in Level6.

1. When EnableFlag=1,Motor starts to run normally, speed motor starts to run normally, speed can be controlled normally.

But,EnableFlag=0,The motor is still running and cannot be stopped. Which variable should be modified to stop the motor?

2.When SpeedRef=0,motor can stop,Is that right?

3.When EnableFlag=1,Motor starts to run normally, speed motor starts to run normally, speed can be controlled normally.

It takes a long time for the motor speed to accelerate from 500rpm to 7000rpm. I hope the acceleration time of the motor is shorter.

How should I control the acceleration of the motor?