When I switch to landscape mode (NUMPAD 7 or CTRL+F11) the emulator rotates the screen to landscape orientation but the Android OS and none
Once you click the change orientation button, a small icon displays on the emulator asking if you want to change the orientation of the emulated screen. It only displays for a few seconds, so look next to the "bottom" icons and you will see this temporary icon.
This works with the emulator keyboard on or off.
I am running Pixel 2 API 29, Android 10.0 (latest versions as at today)