public void fillWith(Item item) {
        Objects.requireNonNull(item, "item");
        for (int i = 0; i < this.inventory.getSize(); ++i) {
            setItem(i, item);
        }
    }
Gets the initial title which was set when this GUI was made

@return the initial title used when this GUI was made
helper/src/main/java/me/lucko/helper/menu/Gui.java