Since upping to 2015 SP5 it seems my task pane will not stay "un-pinned" (Attached)

I have searched and searched and searched the settings to try and find one that will leave it unpinned and have had no luck.

The behavior I'm seeing is I will start SW and the task pane is pinned, I will unpin it, then it will stay that way all through out the day, unless I shut SW down and re open it or restart the computer.

This post is me trying to find an easy solution, if one is not available then I can deal with it until we go to 2016.