Why doesn’t the Cascade or Tile command work?

When the tab is enabled, selecting the Cascade command or one of the Tile commands does not disable the tab. These commands cascade or tile only when multiple groups exist. Therefore, these commands make no sense when only one group exists. This change has been made due to users’ requests. To cascade or tile as the previous manner, disable the tab first, then select one of these commands. New Horizontal Group and New Vertical Group commands allow you to tile windows even if only one group exists.