public void clearGroupSettings(FunctionGraph functionGraph) {
		groupedSettingsUpdateMap.clear(); // clear any unsaved changes

		int transactionID = programUserData.startTransaction();
		try {
			ObjectPropertyMap<SaveableXML> propertyMap =
				programUserData.getObjectProperty(FunctionGraphPlugin.class.getSimpleName(),
					GROUP_SETTINGS_PROPERTY_NAME, SaveableXML.class, false);

			if (propertyMap == null) {
				return; // nothing to do
			}

			FGVertex rootVertex = functionGraph.getRootVertex();
			propertyMap.remove(rootVertex.getVertexAddress());
		}
		finally {
			programUserData.endTransaction(transactionID);
		}
	}
Note: this method does not clear group vertex locations.
@param functionGraph function graph
Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/mvc/FunctionGraphVertexAttributes.java