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

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
Press and hold the alt + ctrl keys while dragging a middle handle

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MS Power Point
To make a selection of slides on our presentation, use a different design template from the other slides, what do you do?

Select the slide thumbnails in that section and apply a different design template
All of above
Select the slides thumbnails in that section, and apply a different color scheme
Select one of the slide in the section you want to change, customize the fonts and colors, and use the format painter tool to apply those styles to the other slides in the section

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