Line attachement

Why do I just not get(understand) the attachment points and how to separate lines/curves in Shapr3d? Is it so hard to make something to understand. What’s with the red line in clamps, once detached maybe what I want to move shows up on the third layer of those points. So I have to move everything around to get to what I need, is that a game or am I just stupid?

Why is there not like in Rhino a sub-menu where you hover over an alternative which highlights sketch item so you can choose intended. I’m getting annoyed by this as I design with lots of editing.