This property specifies the way the shield should resize relative to the text.
Possible values are:
- fixed: the size of the shield will be determined by the ShapeSize (TODO) property and not by the size of the text. This is the default mode.
- free: the shield will be resized independently in both horizontal and vertical axis to fit the text snuggly, regardless of the original aspect ratio of the shield.
- aspect: the shield will be resized to make the text fit into it, but the original aspect ratio of the shield will be preserved.
specifies shield should resize itself freely.