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I wanted to know why most variables in Kotlin are underlined. Some files contain a lot of underlining which is very annoying. If I hover my mouse over a variable it doesn't give any information most of the time. But on some it says "This property has a backing field" or "Value captured in a closure". Does anybody know how to disable those underlines? Here is a screenshot with what I mean: 
And realm is then underlined throughout the entire file.
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To protect your variable from the side effect, the IDE shows the underline as a warning to you. Which is sometimes very helpful to reduce logical bugs in your code.
If the variable/parameter is underlined, you know that you can't use it in lambda/anonymous class directly.
Kotlin uses two different keywords to declare variables: val and var . Use val for a variable whose value never changes. You can't reassign a value to a variable that was declared using val . Use var for a variable whose value can change.
Variables are containers for storing data values. To create a variable, use var or val , and assign a value to it with the equal sign ( = ):
It's just Editor Preferences.
Edit:
This is moved to
Preferences -> Editor -> Color Scheme -> Kotlin -> Properties and Variables 
Thanks rmirabelle for the comment
For the old plugin, you can go to
Preferences -> Editor -> Color Scheme -> Kotlin Then find Var (mutable variable, parameter or property) and remove Underscored effect.
I guess they just try to discourage using var by adding the annoying underscored. :P
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In Android Studio 3.1.2 this has been moved to -
Settings > Editor > Color Scheme > Kotlin
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