From the module options
Go in the module Maximenu CK >> Source tab >> Menu >> Edit
It will open the popup where you can manage your menu easily. You will see each link, with many settings : title, description, columns, submenu width / height / position ..
You can put your mouse over each icon to see the tooltip with the details.
Double click on the title to edit it (or click on the pencil icon), you can then click on the tick icon to save it
You can write your description immediately in the field, it will update accordingly.
From the menu item options
Go in the Joomla menu manager, select the parent item (where your submenu is located) and edit it.
In the menu item edition you will find the additional Maximenu CK tabs, where you can play with many settings. Go in the tab Maximenu CK Params
to get the same options as for the general settings : title, description and much more
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