From Outscape Wiki
The fleet tooltip can be opened in the following places:
Hovering a fleet's label
To open a fleet's tooltip by hovering its label you first need to click the fleet to select it and then hover its label. Hovering the label without first selecting the fleet will not open the fleet tooltip!
If a fleet is moving, the tooltip can be opened by selecting the moving fleet and hovering its label. The fleet doesn't need to be stopped. Right-clicking will deselect the fleet again, allowing it to continue on its journey.