Does DDPI cancels POA

Will submitting DDPI automatically cancel the POA given to Zerodha or need to send a separate form for cancelling the POA?

You will have to revoke the POA, this can be done online if your mobile number is linked to Aadhaar. You can check the process here:

Once the POA is revoked, you can courior the DDPI. You can download the DDPI form here: