Mount and Blade in game FPS counter can not be enabled from “Settings”. So lots of people either use Steam overlay FPS counter or other 3rd party programs like Nvidia Shadowplay or Windows game center.

Actually, all you need to do is heading to this location and editing “engine_config” :
This PC > Documents > Mount and Blade II Bannerlord > Configs > engine_config
Here you should get inside“engine_config” by double click or right click+edit. Look for “show_framerate = 0″ and change it to “show_framerate = 1”. Now you can enter the game and see yellow FPS counter on top right of the screen.
How do I enable cheats in Bannerlord?
While you are here in “engine_config” you can enable cheats and enjoy your new godly powers. Find “cheat_mode = 0” and change it to “cheat_mode = 1”.
Enabling this mode also upgrades your inventory screen. You will see all items on left coulumn and you can buy them at average price anywhere! There are other little bonuses like entering castles without fee and such.
You can use various cheat commands after enabling this feature.
Ctrl + left click: Hold Ctrl and left click to teleport anywhere on the map
Ctrl + F4: In combat, knock out an enemy
Ctrl + Alt + F4: Knock out all enemy army
Ctrl + H: Heal yourself to full health
Ctrl + Shift + H: Heal your horse to full health
Ctrl + F2: Knock out a member of your army
Ctrl + F3: Knock out the player
- Ctrl + Shift + F3: Knock out your horse while you are riding
You cannot use all cheats before starting a New Campaign
If you start a New Campaign you can use all the cheats. Otherwise, some cheats will be disabled for your existing saved game.