Bio-Rad Microplate Manager Software - Manual (Page 138)

Microplate Manager User Guide
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All open windows are listed at the bottom of the menu. The active
window is indicated by a check mark. When more than nine windows
are open, More Windows... is appended to the bottom of the menu.
Choosing More Windows... opens a dialog box in which you can choose
the desired window.
Help
About Microplate Manager displays version information about the application.