[xwiki-devs] Can not opeaate in panel wizard

Hello , I want to trun to both columns layout ,but in the panel wizard the save in new layout and revert button can't be pressed down , I mean I click it but nothing happened. I use XWiki 3.5,loggin in with admin user , and I am sure I havn't done any change about this wizard . It's so strange . Do you have any suggestion about this ? Do I need to change the configuration to do this ? Thank you .