There are three modes for sizing images:
System (default): width and height will taken from TypoScript constants. See Administrator > Setup > Constant Editor > Images.
Record: width and height will taken from the record (from croping or from width and height). Available in single view only.
Plugin: width and height will taken from the plugin
You find the select box with the three modes here:
Plugin > Feature: Image * Size in list view * Size in single view