Sorry, but you are in Newbie mode and it seems to be easier for newbies to have as little customisation as possible. You feel that I do disagree.
Have been pleading to have at least something back, and that is possible in Expert mode. You turn it on by checking this option:
You will not get any workspace, but can create/save custom workspaces after dragging/docking/floating panels. The bars on top ( BBB and Align) however are fixed, cannot be moved. And the nice feature (like in all Adobe apps) that you can reduce a panel to an icon is gone as well.
Lilybiri