Ok. I understand better now. You create "User Presets", but they got bundled along as factory content. I have to add controls to the Interface designer, so they're part of the preset. But then I have to hide them when using the External Floating Tile with C++ JUCE GUI. And the presets only affect the single chain you've created, which can involve many samplers you can enable and disable.
That gets a little tedious having to hide and show controls all the time since I don't want any of them to show, but seems to be working.
UPDATE: Small tip is to place all those controls in a single Floating Tile, and then just show and hide that one component as needed.