In server/datacenter you can disable the plugin which enables this: https://confluence.atlassian.com/jirakb/how-to-disable-invite-user-functionality-621314445.html
But as far as I know this is not possible in Cloud.
Hi @Anuradha Yadav,
You can configure permissions for who can access the Advanced Roadmaps features. If you look under the "Plans" -> "Settings" menu option you will see "Advanced Roadmaps Permissions" - you can adjust the user groups to prevent people accessing plans.
So although there is no invitation model in Advanced Roadmaps you do have control over who can access it,
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events