Can’t see “Title Attribute” field

I just installed and activated the theme to try its features and cannot see “Title Attribute” field when I want to edit the main menu. EBS plugin is installed and configured according to your recommendations (“Use from theme or plugin”). Plugins installed are Contact form 7 and EBS. At first I had also Content Views plugin installed but then suspected that it might cause the problem and deleted it. Helas, the problem persist.