Can't change data structure

This feels super basic but I am struggling to change a field where I am referencing another table from a single entry to a list. This post: https://docs.xano.com/database/database-relationships explains how to do it toward the end, where it shows how to make the class column into one that can take a list of values. The menus seem to have changed which is fine. Now instead the drop down only has two options as seen in the first screenshot. I found it under settings instead, but as you can see in the second screenshot, it seems it is not changeable as there is nowhere to click or adjust this setting. I am wondering if this is a limitation because I am using the free plan? It is quite a frustrating limitation that seems like it should not be happening. If anyone knows if there is another place to change this, if I am setting something up wrong or what I would otherwise need to change to get this to work, I would be very appreciative!

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