To set the initial size of your interaction, click the Properties button on the toolbar.
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In the opened Customization window click the Size button.
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Here you can choose one of the preset slide sizes in the Slide size field. The numbers in the brackets mean the relation between length and width.
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Also, you can set width and height manually by setting the values for the Width and Height fields. If Keep aspect ratio is ticked, the width and length are changed proportionally.
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After the slide size is set, click the Apply and Close button on the toolbar to save and apply the changes.
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