I logged onto this forum to complain that the "Floating Command Line" has disappeared from BW.
Before submitting my complaint, I took one more tour around the various menus and context menus -- my recollection was that I used to get it from the hamburger options button at the top of the Browse Window. Right-clicking on the Browse Window header, I finally (after having looked several times and not having seen) saw "Open Popup CL".
And BW Help does describe the "Popup CL"; unfortunately it does not describe the "Floating Command Line".

The lost has been found, and I can freely navigate my Parallel Versions Window again!