If you expand the menu Game Object, in Object Hierarchy, you will find it has four different components. One of them is for title HoloRetail, and other three Game Objects represent individual product items.
Main menu Game Object in Object Hierarchy
Select the individual menu items from the Object Hierarchy and renamed them to Lights, TV and WallPaint accordingly. This is just for easily identifying the menu items by object name when users tap on it.
Menu renamed objects
You can alternatively do this by tagging them with different name. However, in that case, the script would change to get the object by tag name.
Our next objective will be make the menu interactive and when user perform an Air Tap on menu item, it should get the respective assets downloaded from Azure Blob Storage and render them as hologram with in the holographic application.