In previous versions of OnePager, charts saved directly to PowerPoint, as opposed to those copied and pasted, would result in a 4x3 slide format. Newer versions of PowerPoint default to 16x9, and OnePager now supports both layouts.
Changing the Aspect Ratio
To switch OnePager's PowerPoint export between the 4x3 and 16x9 aspect ratios, go to Home > Chart Properties > Page Layout:
Change the PowerPoint aspect ratio setting to your liking.
When switching from 4x3 to 16x9 PowerPoint, or vice versa, it's a good idea to have the overall aspect ratio of your chart be similar to your PowerPoint slide. It doesn't need to be exactly the same dimensions, but the aspect ratio should be similar. For example, if you are using at 16x9 PowerPoint slide, you could have a chart that is literally 16" x 9", or you could have a chart that is 24" x 13.5". Both charts have the same 16x9 aspect ratio even though they have different physical dimensions.
To change the dimensions of your chart, adjust the Document Width and Row Height until you are closer to a good aspect ratio:
