Each time you get a leader screen and a leader is mentioned, you're supposed to instantly remember everything about them. At first glance three thoughts do deal with this come to mind :
- Clickable leadernames (see screenshot), displaying your diplomatic information, latest spy reports, distance to their border, latest tech, strongest unit, possible allies for you or for them, and so on
- The ability to minimize the leader screen
- Making it a habit to check this every 10 turns