When this item is enabled, objects are automatically reduced to the minimum size, when e.g. the text was changed.
ORCS checks for changes to the object size also, for example, whether the button text still fits in the button. If the text does not fit anymore, then the button is simply enlarged. If the button no longer fits in his parent-object, then it is enlarged too, etc., etc.. But if you want the button text to contain additional information (eg for User-defined objects), then this feature might be annoying. Therefore, it can be switched off here.