Hello,
In your images I can see that you have selected 24 as fps. FPS, stands for Frames per Second. Which means that your video (if you export one) will have 24 images for every second. However this doesn’t mean that your video will be only 24 frames ~1 sec. I am also seeing that your project time is set 209frames and your viewport max at 960Frames. If you want your viewport to only show 24 frames change your viewport max at 23f (given the start is 0 frame the final result is 24 frames). Let me know if that was your primary problem.