Project.xml

<component name="ProjectCodeStyleConfiguration">
  <code_scheme name="Project" version="173">
    <JetCodeStyleSettings>
      <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
    </JetCodeStyleSettings>
    <codeStyleSettings language="kotlin">
      <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
    </codeStyleSettings>
  </code_scheme>
</component>