Is the eccentricity box editable?

[Canche]

I am trying to simulate Alpha A and B in a binary system and want to edit eccentricity to 0.5179.

With my exo planet Proxima B- which is currently orbiting Alpha C- I am able to edit the eccentricity. But with Alpha A and B the Orbital Elements section is grayed-out.

*SOLVED*

I had to start my simulation before being able to edit.