ADS Edit Component Artwork

Hi all,
I just updated the version of my ADS. To design a LNA, I made PAD layout for my amplifier because the ADS lib doesn't have the package layout for the amplifier.

I use component -> edit component artwork to import the layout to the amplifier, but I can't change the component layout type from Default to Fixed and the amplifier's layout is wrong.

How can I change the amplifier's package layout?