Single monitor “duplicated” to monitor that isn’t there.

On an Acer monitor, with a Lenovo desktop running Windows 11, i was trying to set up a second monitor. I hit the “duplicate only” option before i actually had the second monitor ready. the screen went black and will only show “no signal” when i turn it back on after flashing the input options in the top, right corner.

I know how to change it back normally but i can’t see anything on the screen to select options, meaning all i have available is my keyboard but i still can’t see anything i may be selecting. how do i get the monitor back to normal. no duplication, no second monitor, just normal.