Solved this by myself.
The file to be modified to obtain that is:
wp-content/themes/engrave-lite/admin/main/options/02.homepage.php
line 68, just erase “read more” and write in what you want to be shown on the slider button.
Bad news is, seems like you can’t change that from a child theme; so you will need to re-do that on every theme update.
Meh. Hope it helps other people.
