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Good day! I've tried searching for the answer from other posts, but overrides didn't seem to work for me. Basically every time I have a single post the featured image is the first image and it's always so much larger than the rest of the image. When I try to resize by editing, it only changes the resolution.

Additionally, on mobile it remains the same big size, while my other added media become optimised for mobile. Help anyone?

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You can set the featured image size in second parameter based on this document

// without parameter -> Post Thumbnail (as set by theme using set_post_thumbnail_size())
get_the_post_thumbnail( $post_id );                   

get_the_post_thumbnail( $post_id, 'thumbnail' );      // Thumbnail (Note: different to Post Thumbnail)
get_the_post_thumbnail( $post_id, 'medium' );         // Medium resolution
get_the_post_thumbnail( $post_id, 'large' );          // Large resolution
get_the_post_thumbnail( $post_id, 'full' );           // Original resolution

get_the_post_thumbnail( $post_id, array( 100, 100) ); // Other resolutions

actually php cant check the responsive of screen. But if you want check the user run in mobile or not you can use this function.

if ( wp_is_mobile() ) {
    echo get_the_post_thumbnail( $post_id, 'large' ); 
} else {
    echo get_the_post_thumbnail( $post_id, 'thumbnail' ); 
}

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