You have to go to Preferences - > Settings and within your settings step on the setting value
tab_completion (which comes by default in
true ) ..
If that does not work, you can try modifying the settings family that starts with
auto_complete . In particular, for your case, you can see what effect it has to turn off or turn on
If playing with those options does not give you the desired result, there is a way to customize what exactly happens by pressing TAB, using a
.sublime-completions file. I have no experience in the syntax of those files because I have never needed to change it, so in that case I can only refer to the exact section in the documentation on autocompletions .