jetbrains-settings/laf.xml

<application>
  <component name="LafManager">
    <laf themeId="OCEANIC" />
    <lafs-to-previous-schemes>
      <laf-to-scheme laf="CUSTOM" scheme="TheoryOfNekomata" />
      <laf-to-scheme laf="Darcula" scheme="TheoryOfNekomata" />
      <laf-to-scheme laf="Dark" scheme="TheoryOfNekomata" />
    </lafs-to-previous-schemes>
  </component>
</application>