After creating new groups and renaming accounts, I do not find the double-ended arrow to re-order the groups. it doesn’t show at all on my system for any of the accounts for me to re-order.
how can i resolve this please
Please do not divert topics with unrelated questions. Yours was not related to drag and drop problems on Linux. It has been moved to a new topic.
What version number of Manager are you using? And where are you looking?
Linux 
Thanks, @novica. Autocorrect runs wild.