You will need to go to Appearance–> Editor
Click on element-boxes.php on the right
Find the line <span class=”read-more”>”><?php _e(‘Read More’ , ‘discover’); ?></span>
Add <!– to the beginning of the line and –> to the end of the line to comment it out.
It should look like this in the end <!– <span class=”read-more”>”><?php _e(‘Read More’ , ‘discover’); ?></span> –>
Update file.