Setting up the vertical sidefish menu
Step 1
The first thing you need to do is add a module suffix of "sidefish" to your menu module, thus activating the all the necessary css and javascript.

Step 2
Once you have added the module suffix to your menu module, you will need to update you menu to have child menu items. This is done in the relevant menu via Joomla's Menu Manager. An example of a menu with child menu items can seen below:

Example of Sidefish menu in action
The below examples are of how your menu will look once it's setup. Please note that the actual styling of these will vary from themelet to themelet.
Sidefish menu with child (flyout) items:


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