If you are booting up Napoleon at 2560x1440 for the first time, you may encounter a notorious issue that actually makes the game look worse than intended.
Only needed if Method 1 doesn’t work.
HKEY_CURRENT_USER\Software\The Creative Assembly\Napoleon\Settings
Because the game was designed for 1080p screens, running it at 1440p makes the text and buttons very small. This is hard to fix natively, but here are your options: napoleon total war 2560x1440
If you force 1440p but your monitor blinks or goes black: If you are booting up Napoleon at 2560x1440
Even with the perfect setup, you might encounter these: Because the game was designed for 1080p screens,