Just put the pictures you wish to present on your Confluence page
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Just click at the picture you like to start the presentation.
By using < and > you can slide between your pictures
click on the presentation button, to start a presentation
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Now you in the presentation Mode, by using your arrow Keys to can slide to the next picture
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Look at all the Pictures that involve your presentation by going to the left down side, there you are able to choose directly the picture you maybe have to use