layout changes - toggle view

hello all,
in the design layout window on the right hand side no switch view panel appears, i.e. not able to look at widget view or follow the userguide instructions to change the page layout. the idea is to move around blocks on the vendor store page for all vendors’ initial design - ex. analytics graph is to go on the right and plans panel on the left.
i can see the Main Content block but not its contents.
any help much appreciated.
p.s. how do i change the template without coding?
thank you.