Sublime underlined

[Jolivet]

All the code that I write includes it in white lines and it is very ugly, I do not know how to share them so they can see what I mean

[OdatNurd]

What you’re describing sounds like a Code Linter; something that examines your code and tells you about potential bugs, problems and code style violations.

Sublime doesn’t have anything like that built in, so if that’s happening it’s due to a package that you’ve installed. You didn’t mention specifically, but if you happen to be writing Python code the most likely culprit for this is the Anaconda package.