This was strictly a sandbox environment for testing the new vehicle combat and social interactions. Consequently, there is no standard toggle in the main menu or settings panel to switch to a third-person view for the base game campaign.
Eye Level Camera: Experiencing Cyberpunk 2077's Character Bond in Third Person
The developers at CD Projekt Red made a deliberate creative choice to immerse players in the role of V, the mercenary. While playing as the legendary fixer Solomon Reed, the game temporarily shifts to a third-person perspective.
This is not a user-controlled setting but a scripted sequence integral to the story. The short answer is complex, involving technical limitations, developer intent, and the specific version of the game you are playing.
Eye Level Camera: Experiencing Cyberpunk 2077's Character Bond in Third Person
It also simplified the animation pipeline, allowing the team to focus resources on the detailed facial rigs and body movements required for the first-person model. Players hoping for a simple patch to toggle this feature should not expect one in the foreseeable future.
More About Can you play cyberpunk 2077 in 3rd person
Looking at Can you play cyberpunk 2077 in 3rd person from another angle can help expand the discussion and give readers a second clear paragraph under the same section.
More perspective on Can you play cyberpunk 2077 in 3rd person can make the topic easier to follow by connecting earlier points with a few simple takeaways.