mouse not working between 2 monitors

[Microsoft Windows]

Hello,I'm trying to use my laptop as a second monitor for my PC. When I try to move the mouse from my main monitor to the laptop screen, it doesn't work. However, moving it the other way around (from the laptop to the main monitor) works fine.Also, when I switch to the second HDMI input in the PC settings, it works, but on the first HDMI input, it doesn't.Can you help me set up dual monitors correctly?

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