Hi Papy, the tool you are looking for is called “trim” and is part of the “edit nodes” tools. I made a quick gif to show how it works. What you cant see is after I start the edit nodes tool and select the line to trim, I am pressing the T button on my keyboard to trim the line.
This functionality is common in vector editing tools like Lightburn or Illustrator.
Documentation on the tool can also be found here: Node Editing - LightBurn Software Documentation
