On GeForce Now platform, in Anno 1800, going in first person mode (CTRL+SHIFT+R), the player is unable to rotate the camera (view) at 360 degrees (can't fully make a full circle with the camera). This is possible with the game running on local machine.
Not sure this is a limitation of the GeForce Now virtual environment, as there are games where you have this possibility, thus I'm assuming is an Anno 1800 related bug, for the first-person camera mode.