One of the signature things in Bethesda games is the dialog camera, during which the entire screen is occupied by the face of the character with whom the player is having a dialog. Starfield has received a mod from Antonix35 that changes this.
According to PC Gamer, Disable Dialogue Camera gives players more freedom of action when talking to other characters and allows them to have dialogues with the camera in the first or third person and even move.
In addition, it works with Enhanced Dialog Interface, a mod that improves the overall interface of dialog windows and allows for customization.
To download and install the mod, go to the official Disable Dialogue Camera page on Nexus.