Right click on a choice, select Parent Group Options, uncheck Hide Group Title.

hi Ilya_Golovin ,
You can achieve the same following below steps:
Right click on the option whose group title you want to unhide .
Then go to "Parent Group Options", untick "Hide Group Title"
Hope this resolves your query!!

Update: I did not have the options assigned to each group.  Once they were assigned I was able to unhide the group name. I am in CX and having the same issue of trying to unhide one of my groups but I don’t have a Parent Group Options? Is there any other recommendations?  I have not published the survey yet, so I don’t know if that would be the reason.