It has nothing to do with vsync, and everything to do with the method you chose to use for video or frame output. Generally speaking, you won't be able to use the built-in capture tool while keeping high framerates inside the program, because the program will not render a new frame until the previous frame has been output and everything in the scene is loaded for the next frame. This ensures maximum quality and smoothness in the final video. If you want to record exactly what you see on the screen in real time, with quality being a secondary consideration, then use a program like OBS Studio to record video.
Ryzen 7 3700X, 64 GB DDR4-3200 RAM, GTX 1080 Ti 11 GB VRAM
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