Hi there,
1. That button changes various settings within the current list to work along with the card style. For example, if a card needs the title above the featured image, it will set that option for you.
2. If you save the list after clicking the button, you will need to manually revert the options back to what you need within that specific list. The button doesn’t do anything when it comes to future lists.
3. Have you tried setting that card along with 3 columns/image sizes in the options? It should all work nicely.
Any chance you can open a new topic for the other issue?
Thanks!