to my knowledge its not possible. i've tried to invoke GUI from lec's command prompt, that works, but to invoke design vision from dc_shell, i don't think its possible
generally with any tool in SYNOPSYS yu can simply type : gui_start it will direct you to the GUI mode. But Design Compiler is a special case, its GUI Mode is Design Vision, so the only one way ( from my opinion ) is : 1st quit (dc_shell)
2nd : invoke Design Vision. But surely your current data will not be transfer there.