@property<EOL><INDENT>def on_by_default(self):<DEDENT>
return self._on_by_default<EOL>
Gets the on_by_default of this CatalogModifierOverride.
If `true`, this [CatalogModifier](#type-catalogmodifier) should be selected by default for this [CatalogItem](#type-catalogitem).

:return: The on_by_default of this CatalogModifierOverride.
:rtype: bool