Hi Amer3,

It is no longer solved with the workflows. To remove the OOTB Change Tasks copy either Change - Normal - Implement, Change - Emergency - Implement or Change - Standard - Implement in Flow Designer and remove the Subflow Change - implementation tasks from it.

I hope I was able to help you,
David

We were hoping to do this without customizing the flows.  Wish ServiceNow would have developed this in a way that wouldn't require customization, rather configuration with a template of some sort... Maybe a good idea to submit to SN !

Even after removing the sub flow change implementation task from the flow that we copied from OOB flow still the tasks are getting generated? 

Even after remove the sub flow change implementation task from the flow that we copied from OOB flow still the tasks are getting generated? 

It is being controlled by Workflows now, not Flows. Go into your Workflow Editor and disable the change task sub-workflows.