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Go into VBE and click on "ThisWorkbook" and the go up to view and select Code.
Sub Auto_Open()
Application.DisplayFullScreen = True
End Sub
then you will need to turn it off...
Private Sub CommandButton1_Click()
Application.DisplayFullScreen = False
'Closes workbook without saving changes
ActiveWorkbook.Close False
End Sub
i have a button (just an inserted shape) on my sheet to exit the program, linked with the macro to close the workbook and exit full screen mode.