SDK reference/HorizontalInsetsVersion12.7.013.4.1latest13.4.013.3.113.3.013.2.013.1.113.1.013.0.113.0.012.8.012.7.112.7.012.6.412.6.312.6.212.6.112.6.012.5.112.5.0mainunreleasedYou are reading 12.7.0. See this page in 13.4.1.HorizontalInsetspseudoAndroidiPhoneiPadmacOSExtended by PaddingProperties2Dictionary object of parameters for horizontal-only insets applied to Table and List views. Only left and right properties are used (see Padding). Properties 2leftNumberLeft padding/inset Default: 0rightNumberRight padding/inset Default: 0