Hi Louvail:
Try to ignore the hover functionality. That could be a click or anything else.
The main point of the example is to show how to make use of two data collections and join them using a bridging collection.
The way the example works is when you hover over the persons name (this is a repeater) it sends a message from the onClick to change the profile card and setFilter on the data set that drives the hobby list.
The hobby list is one data collection, the members are another. With a member selected by hovering over the list - you can click on the drop down which lists all hobbies and when you select one it is automatically added to the bridging data collection and the repeater listing hobbies for the member is updated. You can also delete hobbies from the list for each user and the applicable record will be deleted from the bridging data collection. Then the repeater will be reset.
If you look at the code for the page you will see how the two data collections are joined by looking at the dropdown onChange function and the delete onClick function.
I have also provided a view of each data collection to show what fields are needed to make this work.
If you want me to look at your specific page you will need to contact me directly using the information on my profile.
Cheers