How do you rename the names of the tree items like the divs or labels to the name you need?
Each element in the left pane has a name that identifies what it is (bloc, row,column). You can’t change them but you can add a unique id. Click on the element in the left pane and at the top of the right pane (inspector) the first panel is ID. You can give the element a ID. This will give the element the name, lets say Bloc #menu or Row #header.
Hope this helps