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

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

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MS Power Point
How to create additional Guide Lines?

by holding Alt key, click on existing Guide Line and drag
by holding Ctrl key, click on existing Guide Line and drag
Additional Guide Lines cannot be created
by holding Ctrl + Alt key, click on existing Guide Line and drag

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MS Power Point
The difference between Slide Design and Auto Content Wizard is

AutoContent Wizard is just the wizard version of Slide Design
Slide Design does not provide sample content but Auto Content Wizard provides sample content too!
Both are same
Slide Design asks your choice in steps but Auto Content Wizard does not let you make choices

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