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Technically, it is possible to make a small creature appear large. However, the model will remain the same; it will simply occupy a 2x2 grid. But this is not done directly in the editor; it requires modifying the game's internal files.
Added 1 minute ago
Here's another question: how can I prevent the AI from buying an army in a castle and recruiting creatures from dwellings? So that it simply stays in the castle?