Two monitors connected but they show as one ultrawide display

[Garry Saputra]

I have 2 monitors for my computer set up. But I don't know why, the display become ultrawide 3840x1080p as one display on 2 monitors, but the 2nd monitor isn't detected in the system. In advanced display settings, it only shows 1 monitor. I want to change it to the extended 2 monitors detected as usual where I can use each monitor for specific purpose, not as a single fullscreen display on 2 monitors. Please help.

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