You can break the link between an object and the style or style set applied to it. When you break the link, the object retains its current appearance. Subsequent changes to the style or style set will not affect the object attributes.
If the Break Link to Style command is not available, there are no styles or style sets applied to this object.
You can also break the link between an object and a style by clicking the source indicator next to the styled property (outline, fill, paragraph, character, or frame) in the Properties docker and choosing Not Styled.