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

All of above
Clicking and edit and select all
Right click the chart background and then click select all
Press and hold the SHIFT key and click each box

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MS Power Point
To maintain the perspective (height and width ratio) of an object when resizing, you need to

Press and hold the alt + ctrl keys while dragging a middle handle
Press and hold the shift key while dragging a corner sizing handle & Drag a corner sizing handle
Press and hold the shift key while dragging a corner sizing handle
Drag a corner sizing handle

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