Hello everyone
I already completed Cyberpunk a few years ago, and I liked it a lot, now I have decided to try it again after all the changes it has had, but now I have a 21:9 ultrawide monitor with a resolution of 2560x1080, but the game instead of adapting to the resolution of my monitor or add black bars to the sides, it just stretches the image, and that seems like the worst thing a game can do to me. In the game settings, the maximum resolution that it allows me to set is 1920x1080.
Can someone help me change this?

Sounds like a simple case of the game not recognizing the resolution of your new monitor.
I am playing at 48:9 (7680x1440), and I haven't had the image being stretched at any point (except on patch 1.03, when such a resolution wasn't fully supported yet).

A few steps to troubleshoot the issue:
After using the new monitor, have you restarted your PC?

Have you updated your graphics driver with a CLEAN install?

If your new monitor has one, have you installed the driver from the manufacturer for your specific display?

Have you tried playing Cyberpunk 2077 in windowed mode?

Have you verified the game files?