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?

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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)

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