To rename this computer or change its domain or workgroup, click Change. Grey out while changing system property

while changing the system property I got the Change button greyed out means disabled as below

Hence I was not able to change the domain.
finally I come to know that the server was promoted to a CA from add roles and features.
then you go and remove the role from manage computer from server management. this may needs restart.so after that it should be fine and you can change the domain.


Regards,
Yes.Sudhanshu