When using Ubuntu 20.04, a workaround along the lines of comment #17 is to go to Settings -> Screen display and then set the primary display to the display other than the one currently selected.
If the dock was previously shown between the 2 screens, this would move the dock to e.g. the left edge of the left screen, which then unsticks the edge between the two screens.
When using Ubuntu 20.04, a workaround along the lines of comment #17 is to go to Settings -> Screen display and then set the primary display to the display other than the one currently selected.
If the dock was previously shown between the 2 screens, this would move the dock to e.g. the left edge of the left screen, which then unsticks the edge between the two screens.