MS Power Point
To adjust the width of table columns, you

Drag the vertical gridline between two columns
Click table menu. Column width, then make adjustments
Drag the vertical gridline between two columns & Drag the column markers on the table ruler bar
Drag the column markers on the table ruler bar

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MS Power Point
How to create additional Guide Lines?

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

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