Hello everybody! kind of new in this world, im using the zen uv tool and I dont know why when i select one vertice its conected to others dont know if that makes sense
Welcome …
this is a general blender thing… you can see this in the on the default cube:
It’s showing the multiple UVs for this vertex. If you wan to edit only one UV of one vertex of a specific face then you have to disable the UVsync selection (top left → two arrows in different directions).
Most likely the reason you are getting the vertices selected in different locations in the UV editor is because you probably have duplicated geometry in your mesh. That one vertex and line on the right side of your UV, is a dead giveaway, especially since you have selected a cube.
Make sure to run the mesh through a merge by distance to stop this.