Can't control timing of multi hairpin Dynamics

Hello,

I’m trying to get multi-harpin in one long note and control the dynamics and timing of it in the
key editor.

If I make a whole note and 3 hairpins (crescendo diminuendo)
They are automatically set and can’t be moved to the left or the right individually.

I need to make 3 with one hairpin on each half note and tie them.

Is it possible to do the same thing with one whole note?

Also if I start with mezzo forte I can’t move the hairpin to a lower volume as mf.