Hi Ram,
For removing the role from connector group 1, Go to NWBC -> Access Management -> Role Maintanence -> Role Search
Search for "Role 1" and you should see 2 results.
Select the Role with landscape Connector group 1 and Delete.
In the confirmation dialog select NO to delete the role only in BRM(front end) and not in PFCG.
Hope this helps.
Regards,
Manju
P.S : Can you also let us know the purpose of assigning connector(ECCPRD) to 2 different groups.