There is nothing in the base code to limit it to 15. There is a limit of 15 per page, but that can be changed in your features page from the admin panel.
English clearly isn't your first language; if you want to post in your native language, I'm sure somebody will be able to translate for you.
Search is your friend “I was having a mildly paranoid day, mostly due to the fact that the mad priest lady from over the river had taken to nailing weasels to my front door again.”