Cannot hide junky tool pane in DC pro
Every time Pro starts I have to press Shift-F4 before I do anything else.
If you want to collapse the Tools Pane for all the future Sessions,
In Acrobat :
1) Launch any PDF and collapse the Right hand panel(RHP) using the vertical collapse strip(with small triangle icon)
2) Close acrobat and relaunch any file ---> RHP will appear collapse for every further session
If that doesnt work for you, Could you please confirm me your Acrobat version because this should be fix with the latest available patches.