I've given each component an ID so you can see which ones are new

Drag a new container(1) into Views
Drag a new nestedlist(2) into Views
Drag a new toolbar(3) into nestedlist
Drag a new toolbar(4) into Views
Drag that toolbar(4) into container(1) > Link it(5)
Duplicate the linked toolbar(5) within the container(1) so there is another linked Toolbar(6).
Drag the second linked Toolbar(6) into the nestedlist(3) (you now have two toolbars within your nestedlist)

It seems it doesn't know the linked instance (white dot with blue line) is a toolbar so it lets you have as many as you want in there