It is called "Database Containers window" because each tab represents a
Container and each Container stores a particular type of Objects.
Is your database split and each user has a separate copy of the Front-End?
Are you sure the Database Containers window is hidden or it is in another
part of the Access Application window and the users don't realise this? The
hint in the later case is the scrollbars appearing for the Access
Application window.
It depends on your set-up and I am not sure what you meant by "the
relationship can be seen" but try the following on each problematic
computer.
* If you see the scrollbar on the Access Application windows, use the Menu
Window / Cascade to see if the Database Containers window re-appears.
* Also try the Menu Window / Arrange Icons ... and see if the Icon for the
Database Containers window re-appears.
* Try also the Menu Window / Unhide and see if the Database Containers
window is listed as hidden. You can use the same dialog to unhide it.
* Try also F11 to show the Database Containers window.
* If each user has a separate copy of the Front-End, use the Menu Tools /
Start-up ... to check the settings for the Start-up options. There is an
option to hide the Database Containers window in Start-up options.