How to use E18-D80NK IR PROXIMITY Sensor?

Hello all? I have an E18-D80NK IR PROXIMITY Sensor and I want to change its range to 20cm. I searched through internet so many times to find an answer but I could not find except I can change its range to 3 to 80cm. Please help!

You aren't making sense. The range specification from the data sheet:
"Sensing range : 3cm to 80cm (depends on obstacle surface)"

20cm is inside that range. 20cm is not a range, it is a distance. So what is your actual problem?

it only senses an obstacle that is 5cm far away from it.

We aren't omnipresent deities that can see what you're doing over there.

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