SQL Server user can access all databases issue

Following are the steps to resolve this issue.


1. Go to user's properties:

2. Go to user mappings:

    2.1. check the default database for login.

    2.2. check db_owner in database role membership. 

3. click default schema button

    3.1. type dbo and click on.

4. click server roles and confirm uncheck of sysadmin permissions.