Greetings, I allow myself to send this message here because I indeed have also the same problem as John255.
My problem is similar but instead of the E key, it's the A key to me (AZERTY keyboard) I play ZASD, so when i want to strafe left, it also rotate left.
I have tried to change the keybind by going to PC/Documents/Mount and Blade II Bannerlord/Configs in the BannerlordGameKeys (the XML document) but it seems its not inside it.
so there is no way to change the rotation map keybind neither in game and in the files)
here i send 2 screenshots of my binding and the campaign map keys which there is no option to change the rotation.
Thank you for reading and have a nice day.