Flex/pull function how it works

3D Design
1

Hello.
SW2025
I would like to understand how the traction tool works:
image
I don't understand this story of adjustment plan 1 and 2 at all.
For example, I would like to stretch (pull) this piece by keeping one of the 2 square faces in the same place.

If someone can help me with this, it would be great.
Have a good day to everyone

2

I got my answer while watching this video:

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