MS Power Point
To select all the boxes of an organization chart

Right click the chart background click select all
Click edit, select all
All of the listed here
Press and hold the shift key and click each box

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MS Power Point
To edit the text within the boxes of an organization chart, you

select the box and text, then make changes
select the box, then make the changes
highlight the text, them make the changes
select the box and text, then make changes & select the box, then make the changes

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