The issue can be replicated as:

1.	Open open office presentation part.

2.	Insert a slide.

3.	Insert any alphabet e.g ‘G’ in the text boxes.

4.	Click EDIT from the main menu bar and select ‘Duplicate’ option.

5.	Insert no. of copies = 10;

6.	Insert Placement  values as :
     i.	X axis >= 10 cm
    ii.	Y axis = 0 cm
   iii.	Angle = 0 degrees
7.	Click OK keeping the other values as  default values.
8.	Check the text box  for the new copies by clicking the text box and   
        dragging.
9.	Notice that window  does not get extended to show all the duplicate 
       text boxes ( in other words, all the 10 duplicate text boxes cannot be 
       viewed). 

 Note : Keep the font size minimum for the test, as higher font size allows 
lesser number of text boxes to view.