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How to show menu name instead "SUB MENU " each page?
Most likely this is the title of the module that you have selected to show that menu.
Search in module manager for a menu module named Sub Menu, click to edit it and change its title.
You need to give that module a title that you want to show, and then Set'Show title' option to 'Yes'. Also you can set the Menu title and show it as well.
But I guess Module option will work for you.
Required, but never shown