There are 3 different ways that an element in Flexitive can be displayed. These options are Fit, Fill and Crop, and Stretch. Some elements may not have all 3 options. You can select which of these options you would like to use in the Size and Position panel.
The default setting for an image is for it to Fit in the bounding box. When an image is set to Fit, the entirety of the image will be contained within the bounding box of the image. The image will also maintain it's aspect ratio, regardless of the size of the bounding box.
Fill, Crop and Zoom
When an image is set to Fill and Crop, the image will expand so that the entirety of the bounding box is filled by the image. This will not change the aspect ratio of the image.
After setting your element to Fit and Crop, you'll have the option of changing the Zoom of your element. Use the Zoom Slider, in the Size and Position Panel, to zoom in or zoom out of your element.
The default setting for a shape is for it to Stretch in the bounding box.
You may notice in the center of your image there is a green and black circle. This circle is your image Focus. Using this, you will be able to control what part of the image you will be looking at, allowing you to Crop your image.