I have been enabled with Project Administrator and Administrator privileges but still I do not see project settings and other features which administrator should have.
Hi Dinesh - Welcome to the Atlassian Community!
You should show up with the Project Settings if you have Administer Project permissions on the project. Maybe try going a different route.
Go to Settings > Projects
That should give you a list of projects. Then click the 3 dots to the right of the project desired and click on Project Settings there.