I have just installed Wampserver version 3.1.7_x86. In phpMyAdmin 4.8.4. User ROOT has 'all priviliges' but a message at the top of the screen says 'You do not have privileges to manipulate with the users!' I did find:
[github.com] but unfortunately don't understand the suggested solution about:
$cfg['Servers'][$i]['DisableIS'] = true;
[github.com] but unfortunately don't understand the suggested solution about:
$cfg['Servers'][$i]['DisableIS'] = true;