2D weld look

Hello
I would like to have your opinion on this situation:
When adding an "end treatment" (type a weld bead) between two parts, it is then impossible for me to move the point of the "weld aspect" function when I select the partial length option.
Example: the point circled in red is not selectable because of the representation of the corner cord. If I delete it, I can move the stitch and then I need to put the corner cord back in.

This is very annoying because it forces you to create the cords in a certain order. Is there a solution to this?
Secondly, how do you add several welding aspects to the same edge when it is used for several parts?
Example: I can't add a weld aspect in the area circled in red because I've already put one on the left on the same edge.


Thank you

For the first case, have you tried to "select other" (accessible via the right button)?

I tried but the stitch is not selectable either :/