You need to go to the code (editor) It’s the last option in your reproduction screen. There is right a menu where you can find Header function and there you have to search this:
<a>" title="<?php echo esc_attr( $spacious_slider_title ); ?>"><?php _e( <strong>'Lees meer'</strong>, 'spacious' ); ?></a>
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You can see i changed the text ‘read more’ to ‘lees meer’ but you can change it to the text you want
