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Enable Featured Images for Any Theme

Turns on featured image (post thumbnail) support for themes that do not declare it.

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Code

add_action( 'after_setup_theme', function () {
    add_theme_support( 'post-thumbnails' );
}, 20 );

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  2. Use snippet above adds it from the library in one click. Or copy the code into a new snippet with the same code type.
  3. It is added inactive: review the code and settings, then switch it on.

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