Disable opportunity of customer to view all users in autocomplete form on different fields and restrict opportunity of customer to view profile of other users

Pre-conditions:

• login with credentials of client user;
• user2 in JIRA already exist;
• verify and confirm that user can see only one specific project and tasks from it.

STR 1:

• open specific project;
• find users in the list of issues from Assignee or Reporter columns;
• right click by user's name > Open the link in new tab;
• look at the page with user's data.

Actual results:
User's Full name and email are displayed on the page

Expected results:
User's Full name and email are not displayed on the page

STR 2:

• open Issue navigator of project
• click 'Create' button of Jira Header menu
• enter 'a.' to 'Watchers' field
• look at the list of users

Actual results:
Users of all projects are contained in the list whose Names are started from 'A' letter

Expected results:
Users of only specific project are contained in the list whose Names are started from 'A' letter

STR 3:

• open Issue navigator of project;
• click 'Share' button above the table with issues;
• enter 'a.' to 'User name or email' field;
• look at the list of users.

Actual results:
Users of all projects are contained in the list whose Names are started from 'A' letter

Expected results:
Users of only specific project are contained in the list whose Names are started from 'A' letter

STR 4:

• open user Profile
• add '?name=user2' to the end of URL
• click 'Enter'
• look at the opened page

Actual results:
Full name and email of user2 are displayed on the page

Expected results:
Full name and email of user2 are not displayed on the page

Please, suggest, what we can do in this cases, thank you in advance!