Some of the Object Categories can be renamed.
To do this, go to Menu > Show/Hide Toolbox. This opens your “Toolbox” window.
In the Toolbox window go to the Settings tab (top right icon). Then in the selector at the bottom of the window, select “Server Setup”. Scroll to the bottom of these settings to find “Rename Object Types”.
Then, click on the User / Object Type that you wish to rename, and type the new name in the window that opens up.
It is not necessary to use all the categories (e.g. only use one for Users) – in this case just leave the field name empty for those you don’t wish to use.
Remember, as it is possible to define different types of Objects using Object Classes, this can reduce the need for as many different Object Categories in some cases.