Welcome. Can you post your file? Without it we can only guess what "this project" is.

See attached file. There must be a small space between the elements of the array.

The pattern is an array that does not really have a start or endpoint, the length is the length of a translation vector. And what would be the start point of (for example) a cylindrical feature? In an older version of the page the text is: Define the Length (distance) between the last copied occurre...

Without your file it is very unlikely that anyone will look into this. Maybe also consider using Draft arrays (Draft_OrthoArray)...

With some more planning this exercise can become a lot easier. Notice how both sketches are constrained relative to their axes in the attached file.

chrisb wrote: ↑Thu Apr 18, 2024 7:06 am Here is a real life FreeCAD model, which would like to see AI generated:

It seem clear that gNucleus does not generate CAD models at all. It provides a language interface to change the parametrics of existing CAD models (created by humans).

Changing to that setting should make the Property view detachable from the Tree view. But you may have to detach manually. In fact, AFAICT, you don't have to restart.

wjr wrote: ↑Wed Apr 17, 2024 11:33 pm you also found this out by trial and error

That is indeed the case.

I don't think it is correct to say "length of the original feature" as that is not how the length is measured, it is rather the distance from the first to the last occurrence. In real life this is rather common of course: If you have to evenly space 10 objects you have to divide the total ...

Two workarounds:
viewtopic.php?p=621236#p622859
viewtopic.php?p=744576#p744495

The 2nd is the easiest.