Why is there a right margin line in Android Studio editor window?
To disable In Android Studio 4.
File > Settings > Editor > Code Style > "Select the programing languae"** > Line length
Set it to: 300 for example.
Screenshot
For the new Android Studio the location is: Editor > Code Style > Hard wrap at. The standard value is 100, just change to 0
If you are using Dart language:
settings -> Code Style -> Dart
and set Line length to your preference.
I guess you mean this line?
That's a ruler for the max column width.
You can change the max column width from:
File > Settings > Editor > Code Style > Right Margin (columns)