I do not know if there is a better method but fro sure works this:
You go to Studio, down right you select "Studio classic" (the older version).
after that in studio classic upper left the "Youtube" drop down menu have a "My channel"
option. By clicking it you transfer to old layout. Guess you will have to bookmark it somehow.
Edit --> you just click the Youtube icon upper left and it goes to old layout (without "my channel" option...)