There's two places. And it's not a silly question at all.
1) You can get a trait hover help panel from your leader in the diplomacy screen.
2) If you have set your BUG options to enable it, you can simply hover over the flag on the main screen to see your leader's traits.
When you get hover info on your leader traits, you can hold down shift as you move to hover over the information source (the icon) and it will show a breakdown of the information about the next trait on the list of traits you have. If you keep holding down shift, moving the mouse cursor off, then back onto the icon, you'll find it cycles through the different traits and at one stage, it's showing no breakdown of a particular trait details so that you can see all the traits the leader has, simply by name.