To edit the size or alignment of your Content Blocks individually, go to the Design Tab and click on one of them. A menu will immediately pop-up on the right side of your screen. 

You'll find here the option of adding or editing a caption. As well as many different ways to crop your image in different shapes. 

You can also Drag & Drop your images within the slide. Use the grid to align and position your Content Blocks when dragging them. 

 

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