Resizing When you select an object, sizing handles appear at the corners and along the edges of the selection rectangle. You can resize an object by dragging its sizing handles, or you can resize it more precisely by specifying percentages for the object's height and width.
Cropping If the object is a picture — for example, a photo, bitmap, or clip art — you can crop it, that is, trim the vertical or horizontal edges of it. Photos are often cropped to focus attention on a specific area of the picture. How to crop a picture.
Restoring You can restore pictures that have been cropped or resized. No matter how many times the picture has been changed, Microsoft Graph keeps track of its original size when it was first inserted in your chart. How to restore a picture to its original size.