I had a couple 4.9 games with over a hundred systems explored. I deleted the 4.9 executable, though, so I can't show the maps off. (And I couldn't fit them on the screen, anyway.)
As for the red circles around those three systems, that means they're selected to be moved as a group. Shift-drag one of them, and the other two will follow. You select them by clicking on the background and dragging a box around them. Drag an empty box and they'll be deselected and look normal again.