PrF UG windows cascading open forms
From Protege Wiki
Cascading All Editor Windows
Protege allows you to have multiple free-standing Editor windows open at a time. Each Editor displays the information for a class, instance, or slot. In addition, you may choose to detach one or more of the Protege tabs. As you continue to work with a project, you may find that these windows get hidden, or that the screen gets cluttered.
To cascade all open Editor windows, select Windows | Cascade Windows. All open Editor windows will be brought to the front and cascaded.