Zooming
From Stars!wiki
⇒ To zoom in or out of the Scanner, use the View (Zoom) menu command or click on the Zoom tool: 
Stars! can zoom the scanner from 25% to 400%. The zoom factor does not change the way you select and command fleets and planets.
If you have trouble selecting a particular planet or fleet because the Scanner Pane is too crowded, just increase the zoom factor a bit. If you are plotting global strategy and need to see your whole empire just decrease the zoom. To quickly zoom in and out, use the + and - keys on the numeric keypad.
- Tip: You can also change the amount of universe displayed by left-clicking and dragging on the left or bottom edge of the scanner pane or by using the menu command, View (Window Layout).
