I've changed my ubuntu desktop environment from unity to gnome. It works almost fine but I don't like gnome classic panel (attached)classic panel on default user. The weird thing here is that after creating another new user, gnome layout is different (exactly as I like non classic gnome on new user). I would like to get rid of gnome classic. Is there any way to do this? I've tried to find this configuration in tweak tool with no success.
Data : Ubuntu 16, gnome3