Hello @sethuanand2626 ,
If you go to the project that you have created the request queue with.
Click on the three dots to edit the project.
If you go down to Task Settings you will see all the settings you need there. I am assuming you want the when someone is assigned to an ISSUE setting and change the to manage.
If you happy with the solution can you mark it as the accepted solution to allow for users to find it please