Screenshot editor
The Screen Editor is part of the Designer mode. Within the Screen Editor, you can specify the visible part of a screenshot (i.e. crop the picture). This is helpful if you need to crop a large image and display only a certain part of it. Drag the sides of the red frame to specify the visible part of the screenshot.
You can also add text labels to the screenshot. Because text labels are independent objects, you can edit, move and delete them.
The toolbar allows adding, displaying and deleting text labels. 
This selection specifies the font face for selected label.
This selection specifies the font size for selected label.
This selection specifies the font color for selected label.
This selection specifies the label text style: bold, italic, or underlined.
This selection specifies the label text alignment: left, center, or right.
Push the button to toggle show\hide the Frame settings panel. 
Drag sides of the orange frame to set the visible part of the screenshot.