Left Sidebar menu only suggest "Show table of content"top menu with a checkmark ?

The Right sidebar menu suggest Debugger and Notebook Tools.

Should it be just a "Show table of content" top menu, or were the three Notebook Tools, Debugger and TOC supposed to be showable left and right ?

Additionally "Notebook tools" is a blank panel for me. If it's supposed to only show things sometimes, maybe add a placeholder text saying "this will show X, Y, Z, when P1, P2, P3" ?