How to shorten a track?

[Earentir]

Hi, I am able to copy paste a bundle of viers and tracks I have put on the PCB but then I can't find a way to shorten the pasted tracks. In the properties I can see the size of the segment but cant alter it in any way.

JFY This is my first ever time touching a PCB software or doing any PCB work so I am probably being dump and its obvious, so sorry in advance