EVE Launcher Order Characters

How can I change the order of the characters in the launcher group menu?
I would like to correct the order of the characters in group 2: I would like to put alpha at the top of the list and gamma instead of alpha; to have the right login order.
I would also like to decide the order of the groups in memory Eve-launchers.
Is there any files I can edit?

Remove all accounts from the group. Then add them in the order you want them.

@GM_Mechanic

thanks for the reply, it works.
To reorder the groups, how can I do?