Set Encoding of File to UTF8 With BOM in Sublime Text 3
Into Preferences > Settings - Users
File : Preferences.sublime-settings
Write this :
"show_encoding" : true,
It's explain on the release note date 17 December 2013. Build 3059. Official site Sublime Text 3
Into the Preferences > Setting - Default
You will have the next by default:
// Display file encoding in the status bar
"show_encoding": false
You could change it or like cdesmetz said set your user settings.
I can't set "UTF-8 with BOM" in the corner button either, but I can change it from the menu bar.
"File"->"Save with encoding"->"UTF-8 with BOM"