Important: The add-on Tree-like Categories Menu requires the addon Flyout Categories Menu to be installed and enabled.
To install the addon, follow the instructions from Installing Add-ons from X-Cart App Store.
Once installed, the add-on converts the category menu representation into a tree-like type automatically.
The addon inherits the settings of the Flyout Categories Menu add-on. Hence, if you want to change anything, follow the procedure described here.