Excel 2011 mac won't print gridlines for my graphs

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I've search high and low and all I can find it how to disable this for Excel, nothing related to PowerPoint? I'm trying to get a PowerPoint presentation to open as a show and loop through the slides while updating the links automatically. How do I disable this prompt? I'm using PowerPoint 2016 Here is a little info on what I'm trying to do: I have a few charts which link to an excel spreadsheet.

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When opening PowerPoint I'm always prompted if I want to update the links to other files.