My connection bar is docked to left, where schema and DB connection infos are displayed vertically. I have 6 different connections to schemas but only 4 connections are visible. The more button (>>) is inactive. Deselect the "Show buttons for current connections" has no effect on number of displayed list item on Window bar list.
It looks like right-clicking on the Window bar does not turn the option on, but you can still make it come on with Options -> Toolbars -> Current Connection Only.