Disables image:
unset( $sizes['twentytwenty-fullscreen']);//1980px width

Displays all image sizes/names:

$image_sizes = wp_get_additional_image_sizes();
	print_r($image_sizes);
	echo '<br>';
	foreach ( $image_sizes as $key => $image_size ) {
	    echo "{$key} ({$image_size['width']} x {$image_size['height']})";
	}

As I understand and found out, is that WordPress – everytime you upload an image, creates three different other sizes of that image: thumbnail, medium and large.

We can even see that in settings-media and then it’s shown, but you can not edit it there.

Is there a possibility to make it happen, that no other image of the uploaded image shall be made? Even though I work with the “Hello Elementor” Theme?

Best regards

Sean