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Once you've selected the stock monster, go to the Classes tab. Click on the "Click to add class levels or hit dice" text, and then scroll down past the classes to the templates. You'll find the Young template there, and once you've added it, the size change should be handled for you, along with the rest of the effects of the Young template.
For future reference, on the adjust tab, add either a temporary or permanent adjustment, and choose "Size Category". Once you've added it, set the value to -1, and you'll reduce the size of the creature by 1 category.
Also, in the editor, even though you can't copy a monster from a package directly, by having the original open at the same time as a new race, you can switch back and forth copying each setting.
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