Question Why is the Gigabyte M32UC with KVM not working ?

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Hello, Recently, I bought a Gigabyte M32UC monitor but it doesn't work the KVM feature.

I am connecting my PC with a DP cable, and I am trying to connect my Oneplus 9 Pro and Samsung S21.

On my monitor connected to my PC:

1. USB-A to USB-B (Original)
2. DP Cable (Original)
3. USB-C to USB-C ( Baseus catsk-B01 )

While connecting the Type-C, a KVM popup appears on the monitor, and then I press the KVM button, letting it return to DP mode.
I have tried to remove all cables from the monitor and just connect Type-C, but then it's showing No Signal.

 

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Information above corrected.