All users set up as Administrators are automatically added to the default User Group "Administrators*". The default settings for this User Group give 'Full Access' to all screens. So as such, you should not see any differences in the access you have had all along. You are not required to make any changes if you want to keep full access to all screens.
However, there may be cases where there are screens that you never use and would like to hide the menu link to simplify what is seen on the navigation panel. In these cases, the Administrators* User Group can be changed so that certain screens have 'No Access' for all administrators.
Example. Suppose you don't use the Piece Tracker screen. Edit the Administrators* user group and set Piece Tracker to 'No Access'. Administrators will no longer see the Piece Tracker link on the Navigation panel.
Note: the first time you log in, you may be missing some menu items on the navigation panel. If so, just log out of Brittco and log back in.