Age of Empires IV supports Keyboard and Mouse on Xbox and PlayStation. After connecting the keyboard and mouse use the steps below to set them up in-game. 

1. Launch Age of Empires IV.
2. From the main menu, Navigate to the Options tab with the controller.
3. In the menu that opens, go down to Controls. 
4. Change the Input Preset from Controller to Mouse/Keyboard. (ensure that your mouse and keyboard are connected to the console)
5. The Keyboard And Mouse option will now be accessible to make adjustments to those inputs. 

Interface menu set to Mouse/Keyboard:

Keyboard and Mouse options:

View Controls:

View and Remap controls: